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Intellectual property law
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Trademark infringement is a violation of the exclusive rights attaching to a trademark without the authorization of the trademark owner or any licensees (provided that such authorization was within the scope of the license). Infringement may occur when one party, the "infringer", uses a trademark which is identical or confusingly similar to a trademark owned by another party, in relation to products or services which are identical or similar to the products or services which the registration covers. An owner of a trademark may commence legal proceedings against a party which infringes its registration.

In many countries, but not in the United States, which recognizes common law trademark rights, a trademark which is not registered cannot be "infringed" as such, and the trademark owner cannot bring infringement proceedings. Instead, the owner may be able to commence proceedings under the common law for passing off or misrepresentation, or under legislation which prohibits unfair business practices. In some jurisdictions, infringement of trade dress may also be actionable.

Where the respective marks or products or services are not identical, similarity will generally be assessed by reference to whether there is a likelihood of confusion that consumers will believe the products or services originated from the trademark owner. If the respective marks and products or services are entirely dissimilar, trademark infringement may still be established if the registered mark is well known pursuant to the Paris Convention. In the United States, a cause of action for use of a mark for such dissimilar services is called trademark dilution.

In some jurisdictions a party other than the owner (eg. a licensee) may be able to pursue trademark infringement proceedings against an infringer if the owner fails to do so.

The party accused of infringement may be able to defeat infringement proceedings if it can establish a valid exception (e.g. comparative advertising) or defence (e.g. laches) to infringement, or attack and cancel the underlying registration (eg. for non-use) upon which the proceedings are based.

• Exhaustion of rights
• Passing off
• Trade dress

• Pfizer Inc. Must Pay $143 Million to Trovan Ltd. in Largest Trademark Judgement Ever Awarded in the United States
• Section 43(a) of the Lanham Act [15 U.S.C. 1125(a)]
• The Trade Mark Act (UK)
• Trademark infringement FAQ Blog
• Good example of common trademark infringement