Kenny Werner (born November 19, 1951) is an American jazz pianist, composer, and author.

Werner started his own trio in 1981 with drummer Tom Rainey and bassist Ratzo Harris. The Kenny Werner Trio matured for fourteen years, touring in America and Europe and recording four albums along the way.

In the 1980s, he became the pianist for The Thad Jones/Mel Lewis Orchestra (now known as the Vanguard Jazz Orchestra). Challenged by Lewis and Bob Brookmeyer to write for the band, he produced his first compositions and arrangements for jazz orchestra, consequently leading him to write for the bands in Europe including the Cologne, Danish, and Stockholm Jazz Orchestras, the Umo Jazz Orchestra of Finland and several times as the guest composer and soloist with the Metropole Orchestra of Holland. Since then Werner has had commissions to write for large ensembles such as jazz orchestras, full orchestras and most in 2007, wind ensemble, choir and string quartet as featured on his album No Beginning, No End (2009).