Jack Oosterlaak

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Olympic medal record
Men’s Athletics
Silver 1920 Antwerp 4 x 400 metre relay

Justus Kinloch Ayres "Jack" Oosterlaak (born January 15, 1896, date of death unknown) 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.