Jason Koster (born 11 March 1983) is a New Zealand judoka.

He competed in the men's 100 kg event at the 2014 Commonwealth Games where he won a bronze medal.

[2] Koster is married to the judoka Moira de Villiers.

[3] They have a daughter together and he has a son from a previous relationship.

This biographical article related to New Zealand judo is a stub.