|Full name||Sidney Ernest Rowland Castle|
|Date of birth||12 March 1892|
|Place of birth||Basingstoke, England|
|Date of death||27 January 1978|
|Place of death||Basingstoke, England|
|Playing position||Outside right|
|1933–1935||Meppeler Sport Club|
|* Senior club appearances and goals counted for the domestic league only.
Sidney Ernest Rowland 'Sid' Castle (12 March 1892 in Basingstoke – 27 January 1978) was an English professional footballer who played for Basingstoke Town, Thornycroft Athletic, Guildford United, Tottenham Hotspur, Charlton Athletic, Chelsea.
After playing for Basingstoke Town, Thorneycrofts and Guildford United, the outside right joined Tottenham Hotspur. Between 1919–20 Castle made five appearances for the Spurs.  He signed for Charlton Athletic in 1921 and went on to play in 66 matches and scoring 10 goals. In 1923, Castle signed for Chelsea where he featured in a further 32 games and finding the net twice. He re-joined Guildford United where he ended his playing career.
- Joyce, Michael (2004). Football League Players' Records. soccerdata. p. 50. ISBN 1-899468-63-3.
- Tottenham Hotspur F.C A-Z of players Retrieved 29 November 2012 Archived 3 June 2009 at WebCite
- Gezinskaart S.E. Castle, Stadsarchief Amsterdam
- Het Vaderland, 30 June 1930, at kb.nl
- Historie 1922-1937, sc Heerenveen
- MSC Meppel