John Leszczynski (b. 1987) is a composer living in Washington, DC. His music has been heard throughout the country.

The Barkada Saxophone Quartet won the Grand Prize at the Fischoff National Chamber Music Competition performing They Might Be Gods. The US Navy Band premiered and toured the country playing Scherzo a la Britten, which was subsequently performed at the American Bandmasters Association 2013 convention by the University of Georgia Wind Ensemble. Other performances of the piece include those by the wind ensembles of the US Army Field Band, Indiana University, the University of South Florida, the University of Tennessee, and the Atlanta Youth Wind Symphony. In the MBM Times, Dr. Jeffrey D. Gershman named Scherzo one of the best new wind pieces of the year. The Herald Times called it "a mighty ear-stunner ... exhilarating to experience."

John's music is featured on three professional recordings: "Derivations" (US Navy Band performing Scherzo a la Britten), "Le Plus Vite Possible" (Jeff Vickers performing Obsidian Butterfly), and "Zzyzx Road" (Zzyzx Quartet performing They Might Be Gods).

John earned a Master of Music degree from the University of Maryland and the Bachelor of Music degree from Indiana University where he also received the Dean's Prize for composition. Teachers include PQ Phan, Donald Freund, Claude Baker, Lawrence Moss, and Samuel Adler.