Likelihood of confusion is the trademark-law question of whether consumers are likely to think goods or services come from the same source.
Why likelihood of confusion matters
Likelihood of confusion matters because trademark law is mainly about source identification, not simply owning words in the abstract. Courts and trademark offices look at how marks, goods, channels, customers, and marketplace conditions interact.
The analysis can determine infringement, registration refusal, settlement terms, and rebranding risk.
Where likelihood of confusion appears
Likelihood of confusion appears in trademark infringement lawsuits, trademark registration refusals, opposition proceedings, cease-and-desist letters, brand clearance reviews, and settlement negotiations.
Practical example
Two companies use similar names for similar online payment services. Even if the names are not identical, consumers might believe the services come from the same source.
How likelihood of confusion differs from nearby terms
Likelihood of confusion differs from trademark dilution because confusion focuses on mistaken source association, while dilution can protect famous marks from blurring or tarnishment even without ordinary consumer confusion.
Related terms
Quick knowledge check
Why can two similar marks coexist in one market but conflict in another?