|Olympic medal record|
|Competitor for South Africa|
|Silver||1920 Antwerp||4x400 metre relay|
Jack Oosterlaak (Justus Kinloch Ayres Oosterlaak; 15 January 1896 – 5 June 1968), was a South African athlete who competed mainly in the 400 metres.
He competed for South Africa in the 1920 Summer Olympics held in Antwerp, Belgium in the 4 x 400 metre relay where he won the Silver medal with his team mates Harry Davel, Clarence Oldfield and Bevil Rudd.
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