Jason Wilnis (born 10 December 1990) is a Dutch professional mixed martial artist and former kickboxer competing in the Middleweight division.

He was ranked in the middleweight top ten by Combat Press between September 2014 and July 2021,[2][3] peaking at #1 between October 2016 and May 2017.

He was keen football player until he followed his older brother, Jahfarr Wilnis to The Colosseum Gym in Utrecht to train kickboxing at the age of 17.

[7] On 28 September 2013 he participated in Glory 10: Los Angeles - Middleweight World Championship Tournament, losing in the semi-finals to Artem Levin by judges unanimous decision.

[11][12][13] He was expected to face Miroslav Cingel at FFC11: Sanchez vs. Bekavac on April 4, 2014, but replaced with Sahak Parparyan because of back injury.

[23] At Glory 30: Los Angeles, he fought a rematch with Joe Schilling,[24] whom he beat by majority decision.

[28][29][30] For his second title defense, Wilnis was scheduled to fight a trilogy match with Simon Marcus at Glory 40: Copenhagen.

[40] In July 2021, Wilnis made the move to mixed martial arts after signing a deal with Netherlands-based Levels Fight League.

[49] Wilnis faced Joey Berkenbosch on March 12, 2023 at Levels Fight League 8, losing by TKO stoppage due to elbows in the second round.