Alex Foster (born 25 September 1993) is an English professional rugby league footballer who last played as a second-row, loose forward or centre for Sheffield Eagles in the RFL Championship.

He played one season for the London Broncos in the Championship before returning to the Super League with the Castleford Tigers, where he spent the longest spell of his career.

He played for Newcastle Thunder in the Championship and was appointed club captain, before re-joining the Castleford Tigers on loan.

Foster played junior rugby league for Wetherby Bulldogs before joining the Leeds Rhinos academy system.

[10] In January 2014, Foster signed a season-long loan deal with the London Broncos alongside fellow Rhinos youngsters Thomas Minns and James Duckworth.

In November 2014, Featherstone Rovers announced the signing of Foster on a season-long loan for 2015, alongside three other young Leeds players.

[20][21][22] Foster demonstrated his positional versatility in 2018, starting at loose forward, second row and centre at different points throughout the season.

[33] In July 2023, Castleford Tigers announced the return of Foster, signing on a season-long loan from Newcastle, alongside Greece international Billy Tsikrikas.