Jimmy Keinhorst is a retired rugby league player. After beginning his career in rugby union, Keinhorst signed a professional contract with Leeds Rhinos, making his Super League debut with them in 2012. He went on to make 90 appearances for the Rhinos, including in the 2012 Challenge Cup Final, and was also an integral part of the Rhinos' treble winning year in 2015. He appeared in the 2015 Super League Grand Final when Leeds beat Wigan Warriors to claim the title. At the end of 2018, he departed Leeds and signed for Hull KR, where he made over 70 appearances. He has featured for eight clubs in his career, before signing with York Knights on a permanent deal in 2024. Keinhorst has also represented Germany across both rugby codes eleven times between 2008 and 2012, scoring 18 tries.