[846]*846Justice O’Connor
delivered the opinion of the Court.
This action requires us to consider the circumstances under which a manufacturer of a generic drug, designed to duplicate the appearance of a similar drug marketed by a competitor under a registered trademark, can be held vicariously liable for infringement of that trademark by pharmacists who dispense the generic drug.
I
In 1955, respondent Ives Laboratories, Inc. (Ives), received a patent on the drug cyclandelate, a vasodilator used in long-term therapy for peripheral and cerebral vascular diseases. Until its patent expired in 1972, Ives retained the exclusive right to make and sell the drug, which it did under the registered trademark CYCLOSPASMOL.1 Ives marketed the drug, a white powder, to wholesalers, retail pharmacists, and hospitals in colored gelatin capsules. Ives arbitrarily se[847]*847lected a blue capsule, imprinted with “Ives 4124,” for its 200 mg dosage and a combination blue-red capsule, imprinted with “Ives 4148,” for its 400 mg dosage.
After Ives’ patent expired, several generic drug manufacturers, including petitioners Premo Pharmaceutical Laboratories, Inc., Inwood Laboratories, Inc., and MD Pharmaceutical Co., Inc. (collectively the generic manufacturers), began marketing cyclandelate.2 They intentionally copied the appearance of the CYCLOSPASMOL capsules, selling cyclandelate in 200 mg and 400 mg capsules in colors identical to those selected by Ives.3
The marketing methods used by Ives reflect normal industry practice. Because cyclandelate can be obtained only by prescription, Ives does not direct its advertising to the ultimate consumer. Instead, Ives’ representatives pay personal visits to physicians, to whom they distribute product literature and “starter samples.” Ives initially directed these efforts toward convincing physicians that CYCLOSPASMOL is superior to other vasodilators. Now that its patent has expired and generic manufacturers have entered the market, Ives concentrates on convincing physicians to indicate on prescriptions that a generic drug cannot be substituted for CYCLOSPASMOL.4
The generic manufacturers also follow a normal industry practice by promoting their products primarily by distribu[848]*848tion of catalogs to wholesalers, hospitals, and retail pharmacies, rather than by contacting physicians directly. The catalogs truthfully describe generic cyclandelate as “equivalent” or “comparable” to CYCLOSPASMOL.5 In addition, some of the catalogs include price comparisons of the generic drug and CYCLOSPASMOL and some refer to the color of the generic capsules. The generic products reach wholesalers, hospitals, and pharmacists in bulk containers which correctly indicate the manufacturer of the product contained therein.
A pharmacist, regardless of whether he is dispensing CY-CLOSPASMOL or a generic drug, removes the capsules from the container in which he receives them and dispenses them to the consumer in the pharmacist’s own bottle with his [849]*849own label attached. Hence, the final consumer sees no identifying marks other than those on the capsules themselves.
a
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Ives instituted this action in the United States District Court for the Eastern District of New York under §§ 32 and 43(a) of the Trademark Act of 1946 (Lanham Act), 60 Stat. 427, as amended, 15 U. S. C. § 1051 et seq., and under New York’s unfair competition law, N. Y. Gen. Bus. Law § 368-d (McKinney 1968).6
Ives’ claim under § 32, 60 Stat. 437, as amended, 15 U. S. C. § 1114,7 derived from its allegation that some pharmacists had dispensed generic drugs mislabeled as CYCLOSPASMOL.8 [850]*850Ives contended that the generic manufacturers’ use of lookalike capsules and of catalog entries comparing prices and revealing the colors of the generic capsules induced pharmacists illegally to substitute a generic drug for CYCLOSPAS-MOL and to mislabel the substitute drug CYCLOSPASMOL. Although Ives did not allege that the petitioners themselves applied the Ives trademark to the drug products they produced and distributed, it did allege that the petitioners contributed to the infringing activities of pharmacists who mislabeled generic cyclandelate.
Ives’ claim under § 43(a), 60 Stat. 441, 15 U. S. C. § 1125(a),9 alleged that the petitioners falsely designated the origin of their products by copying the capsule colors used by Ives and by promoting the generic products as equivalent to CYCLOSPASMOL. In support of its claim, Ives argued that the colors of its capsules were not functional10 and that [851]*851they had developed a secondary meaning for the consumers.11
Contending that pharmacists would continue to mislabel generic drugs as CYCLOSPASMOL so long as imitative products were available, Ives asked that the court enjoin the petitioners from marketing cyclandelate capsules in the same colors and form as Ives uses for CYCLOSPASMOL. In addition, Ives sought damages pursuant to § 35 of the Lanham Act, 60 Stat. 439, as amended, 15 U. S. C. § 1117.
B
The District Court denied Ives’ request for an order preliminarily enjoining the petitioners from selling generic drugs identical in appearance to those produced by Ives. 455 F. Supp. 939 (1978). Referring to the claim based upon § 32, the District Court stated that, while the “knowing and deliberate instigation” by the petitioners of mislabeling by pharmacists would justify holding the petitioners as well as the pharmacists liable for trademark infringement, Ives had made no showing sufficiently to justify preliminary relief. Id., at 945. Ives had not established that the petitioners conspired with the pharmacists or suggested that they disregard physicians’ prescriptions.
The Court of Appeals for the Second Circuit affirmed. 601 F. 2d 631 (1979). To assist the District Court in the upcoming trial on the merits, the appellate court defined the elements of a claim based upon § 32 in some detail. Relying primarily upon Coca-Cola Co. v. Snow Crest Beverages, Inc., 64 F. Supp. 980 (Mass. 1946), aff’d, 162 F. 2d 280 (CA1), cert. denied, 332 U. S. 809 (1947), the court stated that the petitioners would be liable under § 32 either if they suggested, even by implication, that retailers fill bottles with generic cyclandelate and label the bottle with Ives’ trademark or if [852]*852the petitioners continued to sell cyclandelate to retailers whom they knew or had reason to know were engaging in infringing practices. 601 F. 2d, at 636.
C
After a bench trial on remand, the District Court entered judgment for the petitioners. 488 F. Supp. 394 (1980).
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[846]*846Justice O’Connor
delivered the opinion of the Court.
This action requires us to consider the circumstances under which a manufacturer of a generic drug, designed to duplicate the appearance of a similar drug marketed by a competitor under a registered trademark, can be held vicariously liable for infringement of that trademark by pharmacists who dispense the generic drug.
I
In 1955, respondent Ives Laboratories, Inc. (Ives), received a patent on the drug cyclandelate, a vasodilator used in long-term therapy for peripheral and cerebral vascular diseases. Until its patent expired in 1972, Ives retained the exclusive right to make and sell the drug, which it did under the registered trademark CYCLOSPASMOL.1 Ives marketed the drug, a white powder, to wholesalers, retail pharmacists, and hospitals in colored gelatin capsules. Ives arbitrarily se[847]*847lected a blue capsule, imprinted with “Ives 4124,” for its 200 mg dosage and a combination blue-red capsule, imprinted with “Ives 4148,” for its 400 mg dosage.
After Ives’ patent expired, several generic drug manufacturers, including petitioners Premo Pharmaceutical Laboratories, Inc., Inwood Laboratories, Inc., and MD Pharmaceutical Co., Inc. (collectively the generic manufacturers), began marketing cyclandelate.2 They intentionally copied the appearance of the CYCLOSPASMOL capsules, selling cyclandelate in 200 mg and 400 mg capsules in colors identical to those selected by Ives.3
The marketing methods used by Ives reflect normal industry practice. Because cyclandelate can be obtained only by prescription, Ives does not direct its advertising to the ultimate consumer. Instead, Ives’ representatives pay personal visits to physicians, to whom they distribute product literature and “starter samples.” Ives initially directed these efforts toward convincing physicians that CYCLOSPASMOL is superior to other vasodilators. Now that its patent has expired and generic manufacturers have entered the market, Ives concentrates on convincing physicians to indicate on prescriptions that a generic drug cannot be substituted for CYCLOSPASMOL.4
The generic manufacturers also follow a normal industry practice by promoting their products primarily by distribu[848]*848tion of catalogs to wholesalers, hospitals, and retail pharmacies, rather than by contacting physicians directly. The catalogs truthfully describe generic cyclandelate as “equivalent” or “comparable” to CYCLOSPASMOL.5 In addition, some of the catalogs include price comparisons of the generic drug and CYCLOSPASMOL and some refer to the color of the generic capsules. The generic products reach wholesalers, hospitals, and pharmacists in bulk containers which correctly indicate the manufacturer of the product contained therein.
A pharmacist, regardless of whether he is dispensing CY-CLOSPASMOL or a generic drug, removes the capsules from the container in which he receives them and dispenses them to the consumer in the pharmacist’s own bottle with his [849]*849own label attached. Hence, the final consumer sees no identifying marks other than those on the capsules themselves.
a
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Ives instituted this action in the United States District Court for the Eastern District of New York under §§ 32 and 43(a) of the Trademark Act of 1946 (Lanham Act), 60 Stat. 427, as amended, 15 U. S. C. § 1051 et seq., and under New York’s unfair competition law, N. Y. Gen. Bus. Law § 368-d (McKinney 1968).6
Ives’ claim under § 32, 60 Stat. 437, as amended, 15 U. S. C. § 1114,7 derived from its allegation that some pharmacists had dispensed generic drugs mislabeled as CYCLOSPASMOL.8 [850]*850Ives contended that the generic manufacturers’ use of lookalike capsules and of catalog entries comparing prices and revealing the colors of the generic capsules induced pharmacists illegally to substitute a generic drug for CYCLOSPAS-MOL and to mislabel the substitute drug CYCLOSPASMOL. Although Ives did not allege that the petitioners themselves applied the Ives trademark to the drug products they produced and distributed, it did allege that the petitioners contributed to the infringing activities of pharmacists who mislabeled generic cyclandelate.
Ives’ claim under § 43(a), 60 Stat. 441, 15 U. S. C. § 1125(a),9 alleged that the petitioners falsely designated the origin of their products by copying the capsule colors used by Ives and by promoting the generic products as equivalent to CYCLOSPASMOL. In support of its claim, Ives argued that the colors of its capsules were not functional10 and that [851]*851they had developed a secondary meaning for the consumers.11
Contending that pharmacists would continue to mislabel generic drugs as CYCLOSPASMOL so long as imitative products were available, Ives asked that the court enjoin the petitioners from marketing cyclandelate capsules in the same colors and form as Ives uses for CYCLOSPASMOL. In addition, Ives sought damages pursuant to § 35 of the Lanham Act, 60 Stat. 439, as amended, 15 U. S. C. § 1117.
B
The District Court denied Ives’ request for an order preliminarily enjoining the petitioners from selling generic drugs identical in appearance to those produced by Ives. 455 F. Supp. 939 (1978). Referring to the claim based upon § 32, the District Court stated that, while the “knowing and deliberate instigation” by the petitioners of mislabeling by pharmacists would justify holding the petitioners as well as the pharmacists liable for trademark infringement, Ives had made no showing sufficiently to justify preliminary relief. Id., at 945. Ives had not established that the petitioners conspired with the pharmacists or suggested that they disregard physicians’ prescriptions.
The Court of Appeals for the Second Circuit affirmed. 601 F. 2d 631 (1979). To assist the District Court in the upcoming trial on the merits, the appellate court defined the elements of a claim based upon § 32 in some detail. Relying primarily upon Coca-Cola Co. v. Snow Crest Beverages, Inc., 64 F. Supp. 980 (Mass. 1946), aff’d, 162 F. 2d 280 (CA1), cert. denied, 332 U. S. 809 (1947), the court stated that the petitioners would be liable under § 32 either if they suggested, even by implication, that retailers fill bottles with generic cyclandelate and label the bottle with Ives’ trademark or if [852]*852the petitioners continued to sell cyclandelate to retailers whom they knew or had reason to know were engaging in infringing practices. 601 F. 2d, at 636.
C
After a bench trial on remand, the District Court entered judgment for the petitioners. 488 F. Supp. 394 (1980). Applying the test approved by the Court of Appeals to the claim based upon § 32, the District Court found that the petitioners had not suggested, even by implication, that pharmacists should dispense generic drugs incorrectly identified as CYCLOSPASMOL.12
In reaching that conclusion, the court first looked for direct evidence that the petitioners intentionally induced trademark infringement. Since the petitioners’ representatives do not make personal visits to physicians and pharmacists, the petitioners were not in a position directly to suggest improper drug substitutions. Cf. William R. Warner & Co. v. Eli Lilly & Co., 265 U. S. 526, 530-531 (1924); Smith, Kline & French Laboratories v. Clark & Clark, 157 F. 2d 725, 731 (CA3), cert. denied, 329 U. S. 796 (1946). Therefore, the court concluded, improper suggestions, if any, must have come from catalogs and promotional materials. The court determined, however, that those materials could not “fairly be read” to suggest trademark infringement. 488 F. Supp., at 397.
The trial court next considered evidence of actual instances of mislabeling by pharmacists, since frequent improper substitutions of a generic drug for CYCLOSPASMOL could provide circumstantial evidence that the petitioners, merely by making available imitative drugs in conjunction with comparative price advertising, implicitly had suggested that pharmacists substitute improperly. After reviewing the evi[853]*853dence of incidents of mislabeling, the District Court concluded that such incidents occurred too infrequently to justify the inference that the petitioners’ catalogs and use of imitative colors had “impliedly invited” druggists to mislabel. Ibid. Moreover, to the extent mislabeling had occurred, the court found it resulted from pharmacists’ misunderstanding of the requirements of the New York Drug Substitution Law, rather than from deliberate attempts to pass off generic cyclandelate as CYCLOSPASMOL. Ibid.
The District Court also found that Ives failed to establish its claim based upon § 43(a). In reaching its conclusion, the court found that the blue and blue-red colors were functional to patients as well as to doctors and hospitals: many elderly patients associate color with therapeutic effect; some patients commingle medications in a container and rely on color to differentiate one from another; colors are of some, if limited, help in identifying drugs in emergency situations; and use of the same color for brand name drugs and their generic equivalents helps avoid confusion on the part of those responsible for dispensing drugs. Id., at 398-399. In addition, because Ives had failed to show that the colors indicated the drug’s origin, the court found that the colors had not acquired a secondary meaning. Id., at 399.
Without expressly stating that the District Court’s findings were clearly erroneous, and for reasons which we discuss below, the Court of Appeals concluded that the petitioners violated § 32. 638 F. 2d 538 (1981). The Court of Appeals did not reach Ives’ other claims. We granted certiorari, 454 U. S. 891 (1981), and now reverse the judgment of the Court of Appeals.
Ill
As the lower courts correctly discerned, liability for trademark infringement can extend beyond those who actually mislabel goods with the mark of another. Even if a manufacturer does not directly control others in the chain of distribu[854]*854tion, it can be held responsible for their infringing activities under certain circumstances. Thus, if a manufacturer or distributor intentionally induces another to infringe a trademark, or if it continues to supply its product to one whom it knows or has reason to know is engaging in trademark infringement, the manufacturer or distributor is contribu-torially responsible for any harm done as a result of the deceit.13 See William R. Warner & Co. v. Eli Lilly & Co., supra; Coca-Cola Co. v. Snow Crest Beverages, Inc., supra.
It is undisputed that those pharmacists who mislabeled generic drugs with Ives’ registered trademark violated § 32.14 [855]*855However, whether these petitioners were liable for the pharmacists’ infringing acts depended upon whether, in fact, the petitioners intentionally induced the pharmacists to mislabel generic drugs or, in fact, continued to supply cyclandelate to pharmacists whom the petitioners knew were mislabeling generic drugs. The District Court concluded that Ives made neither of those factual showings.
In reviewing the factual findings of the District Court, the Court of Appeals was bound by the “clearly erroneous” standard of Rule 52(a), Federal Rules of Civil Procedure. Pullman-Standard v. Swint, ante, p. 273. That Rule recognizes and rests upon the unique opportunity afforded the trial court judge to evaluate the credibility of witnesses and to weigh the evidence. Zenith Radio Corp. v. Hazeltine Research, Inc., 395 U. S. 100, 123 (1969). Because of the deference due the trial judge, unless an appellate court is left with the “definite and firm conviction that a mistake has been committed,” United States v. United States Gypsum Co., 333 U. S. 364, 395 (1948), it must accept the trial court’s findings.15
IV
In reversing the District Court’s judgment, the Court of Appeals initially held that the trial court failed to give sufficient weight to the evidence Ives offered to show a “pattern of illegal substitution and mislabeling in New York. . . .”16 [856]*856638 F. 2d, at 543. By rejecting the District Court’s findings simply because it would have given more weight to evidence of mislabeling than did the trial court, the Court of Appeals clearly erred. Determining the weight and credibility of the evidence is the special province of the trier of fact. Because the trial court’s findings concerning the significance of the instances of mislabeling were not clearly erroneous, they should not have been disturbed.
Next, after completing its own review of the evidence, the Court of Appeals concluded that the evidence was “clearly sufficient to establish a § 32 violation.” Ibid. In reaching its conclusion, the Court of Appeals was influenced by several factors. First, it thought the petitioners reasonably could have anticipated misconduct by a substantial number of the pharmacists who were provided imitative, lower priced products which, if substituted for the higher priced brand name without passing on savings to consumers, could provide an economic advantage to the pharmacists. Ibid.17 Second, it [857]*857disagreed with the trial court’s finding that the mislabeling which did occur reflected confusion about state law requirements. Id., at 544.18 Third, it concluded that illegal substitution and mislabeling in New York are neither de minimis nor inadvertent. Ibid.19 Finally, the Court of Appeals indicated it was further influenced by the fact that the petitioners did not offer “any persuasive evidence of a legitimate reason unrelated to CYCLOSPASMOL” for producing an imitative product. Ibid.20
Each of those conclusions is contrary to the findings of the District Court. An appellate court cannot substitute its interpretation of the evidence for that of the trial court simply because the reviewing court “might give the facts another construction, resolve the ambiguities differently, and find a [858]*858more sinister cast to actions which the District Court apparently deemed innocent.” United States v. Real Estate Boards, 339 U. S. 485, 495 (1950).
V
The Court of Appeals erred in setting aside findings of fact that were not clearly erroneous. Accordingly, the judgment of the Court of Appeals that the petitioners violated § 32 of the Lanham Act is reversed.
Although the District Court also dismissed Ives’ claims alleging that the petitioners violated § 43(a) of the Lanham Act and the state unfair competition law, the Court of Appeals did not address those claims. Because § 43(a) prohibits a broader range of practices than does § 32, as may the state unfair competition law, the District Court’s decision dismissing Ives’ claims based upon those statutes must be independ[859]*859ently reviewed. Therefore, we remand to the Court of Appeals for further proceedings consistent with this opinion.
Reversed and remanded.