Jay Leonhart (born December 6, 1940, Baltimore, Maryland) is a noted bassist and songwriter working in jazz and popular music. He has performed with diverse artists including Judy Garland, Carly Simon, Bucky Pizzarelli, Sting, and Frank Sinatra. Leonhart is noted for his clever songwriting often laced with dry humor, and his compositions have been recorded by such notable artists as Blossom Dearie, Lee Konitz and Gary Burton. Leonhart's poetry is published both in, and outside of, the venue of song.