Lesley Barber (born 1962) is a Canadian composer of music for film, theatre, chamber and orchestral ensembles and she is also a conductor, pianist, producer, and multi-instrumentalist.

Works include Long White Line (for orchestra), Rhythmic Voodoo (percussion and electronica).

Barber has cited as musical influences Takemitsu, Corigliano, Haydn, Sofia Gubaidulina, Steve Reich, PJ Harvey, Radiohead, Carter Burwell, Ennio Morricone, and Philip Glass.

[2] Barber's work on film scores includes Kenneth Lonergan's Academy Award-nominated feature film You Can Count on Me, Jerry Rothwell's award-winning documentary, How to Change the World, Mira Nair's Emmy and Golden Globe award-winning Hysterical Blindness (starring Uma Thurman and Gena Rowlands), Mary Harron's The Moth Diaries, Patricia Rozema's Mansfield Park and When Night Is Falling, the award-winning children's classic television animated series Little Bear with Maurice Sendak, Wiebke Von Carolsfeld's Marion Bridge, the recently released powerhouse doc The Apology by Tiffany Hsiung and Kenneth Lonergan's award-winning Manchester by the Sea.

Barber has recorded scores in Toronto, London, Los Angeles, New York, and Budapest and worked with Miramax, New Line, Focus Features, Nickelodeon, Warner Bros., and Home Box Office amongst others.