Justus Kinloch Ayres Oosterlaak also known as Jack Oosterlaak (15 January 1896 – 5 June 1968), was a South African athlete who competed in the 1920 Summer Olympics.

[1] Oosterlaak finished third behind Harry Edward in the 100 yards event at the British 1920 AAA Championships.

[2][3][4] The following month at the 1920 Olympic Games held in Antwerp, Belgium, he competed in the 4 x 400-metre relay where he won the silver medal with his teammates Harry Davel, Clarence Oldfield and Bevil Rudd.

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