Simon Paulus Olij (5 October 1900, Landsmeer – 4 August 1975, Amsterdam) was a Dutch heavyweight boxer who attended the 1928 Summer Olympics.
There he was eliminated in the quarterfinals of the men's heavyweight division by eventual gold medalist Arturo Rodríguez from Argentina.
His result was:[1] (in Dutch) Olij, and his son Jan, became members of the National Socialist Movement in the Netherlands (NSB) during the Second World War.
Olij and his son betrayed and arrested numerous Jewish people who were deported as part of The Holocaust.
His son, Jan, while awaiting trial escaped from an internment camp in 1947 and fled to Argentina where he died in 1996.