Chancellor "Chauncey" Olcott (July 21, 1858 – March 18, 1932) was an American stage actor, songwriter and singer.

Born in Buffalo, New York, in the early years of his career Olcott sang in minstrel shows and Lillian Russell played a major role in helping make him a Broadway star. Amongst his songwriting accomplishments, Olcott wrote and composed the song "My Wild Irish Rose" for his production of A Romance of Athlone]] in 1899. Olcott also wrote the lyrics to "When Irish Eyes Are Smiling" for his production of The Isle O' Dreams in 1912.

He retired to Monte Carlo and died there in 1932. His body was brought home and interred in the Woodlawn Cemetery in The Bronx.