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.