Trill means a type of vibration. Uses in this sense include:

• trill (music), a type of musical ornament
• trill consonant, a type of sound used in some languages
• Trill, a sound made by a Maine Coon cat and on occasion in other breeds of domestic feline.

In the vernacular, trill (or treal) also means "honest and true," or "true and real." Uses in this sense include:

• Trill (album), an album by rapper Bun B.

Trill may also refer to:

• Trill (Star Trek), two symbiotic races of aliens in the fictional Star Trek universe
• Trill, an infant NetNavi from the MegaMan Anime.

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