Billy Gillespie (6 August 1891 – 2 July 1981) was an Irish football player who played as a striker for Sheffield United over a twenty-year period from 1913 to 1932, scoring over 137 League and Cup goals in 492 games for the South Yorkshire side. Gillespie was born in Kerrykeel, County Donegal, Ireland and began his career with Irish side Institute in 1907. After a short spell with Linfield he moved to England to play for Leeds City in 1910 before moving to Sheffield United in 1912, where he would stay until he retired from playing. Gillespie also made 25 appearances for the Ireland national team. In 1932 he took over as manager of Derry City where he remained until 1940. After leaving Derry, Gillespie moved to the south of England where he lived until his death in 1981.