Moira de Villiers

Moira de Villiers (born 16 March 1990), also known by her married name of Koster, is a South African-born New Zealand judoka. She competed in the 70 kg event at the 2012 Summer Olympics losing in the first round. She competed in the women's 70 kg event at the 2014 Commonwealth Games where she won the silver medal.

De Villiers is married to Jason Koster; he is also a judoka. They have a daughter together and her husband has a son from a previous relationship.