Moira de Villiers (born 16 March 1990), also known by her married name of Koster, is a South African-born New Zealand judoka.

[2] She competed in the 70 kg event at the 2012 Summer Olympics losing in the first round.

[3] She competed in the women's 70 kg event at the 2014 Commonwealth Games where she won the silver medal.

[4] De Villiers is married to Jason Koster; he is also a judoka.

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