Nicolas Slonimsky (April 27 [O.S. April 15] 1894 – December 25, 1995), born Nikolai Leonidovich Slonimskiy was a Russian-American musicologist, conductor, pianist, lexicographer, and composer.
Throughout his life, Slonimsky wrote extensively for periodicals and newspapers, produced program and liner notes, and contributed to numerous reference works. He is best known for editing Theodore Baker's Biographical Dictionary of Musicians.