Thomas James Keinhorst (born 14 July 1990) is a German international rugby league footballer who plays as a centre or second-row forward for York Knights in the RFL Championship.

[citation needed] Keinhorst signed for Leeds in 2011, and made his Super League début on 30 July 2012, in the defeat by the Wakefield Trinity Wildcats.

[8][9] Keinhorst came on as a substitute in Leeds' losing effort in the 2012 Challenge Cup Final defeat by Warrington at Wembley Stadium.

[10][11][12][13] Keinhorst played from the interchange bench for Leeds in the 2015 Super League Grand Final, and helped to set-up the winning try for Josh Walters, in a 22–20 victory over Wigan.

Keinhorst scored a hat-trick of tries for Leeds in round 2 of the 2018 Super League season, against Hull Kingston Rovers at Elland Road.

[20] Keinhorst is the youngest of four rugby-playing brothers and qualifies to play for Germany through his German father Wolfgang, who has lived in the United Kingdom for many years.