Koos de Jong
Jacobus Hermanus Hendrik Jan "Koos" de Jong was a sailor from the Netherlands. He competed in the Firefly event at the Sailing at the [1948 Summer Olympics – Firefly|1948 Olympics] and in the Finn event at the Sailing at the [1952 Summer Olympics – Finn|1952 Games] and won a bronze medal in 1948, placing fourth in 1952. De Jong won several medals at European championships, including the gold in 1959.