Liam Matthew Farrell (born 2 July 1990) is an English rugby league footballer who plays as a second-row forward for the Wigan Warriors in the Super League, and has played for England at international level.

He has spent time on loan from Wigan at the Widnes Vikings in the Championship.

Farrell was born in Wigan, Greater Manchester, England. His younger brother Connor Farrell played for Wigan. He is first cousin once removed to former Wigan captain Andy Farrell. He played junior rugby league at Wigan St Patricks before signing scholarship forms with Wigan Warriors.

Farrell started the 2010 season on a dual registration loan at Widnes. He made a try scoring home début against Barrow. Wigan Head Coach Michael Maguire gave Farrell his Wigan first team début in the victory over Wakefield Trinity on 5 April, coming off the bench and scoring a try. He played in the 2010 Super League Grand Final victory over St Helens at Old Trafford.

Farrell played from the substitutes' bench in the 2011 Challenge Cup Final victory over Leeds at Wembley Stadium.

Farrell played in the 2013 Challenge Cup Final victory over Hull F.C. at Wembley Stadium, and also played in the 2013 Super League Grand Final victory over Warrington at Old Trafford.

He played in the 2014 Super League Grand Final defeat by St. Helens at Old Trafford.

Farrell played in the 2015 Super League Grand Final defeat by Leeds at Old Trafford.