title: Jack Oosterlaak
text: # Jack Oosterlaak
  
  Jack Oosterlaak (Justus Kinloch Ayres Oosterlaak; 15 January 1896, in Wellington – 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 teammates Harry Davel, Clarence Oldfield and Bevil Rudd.
  
  