Jacob "Jaap" Oudkerk (2 August 1937 – 17 February 2024) was a Dutch cyclist. He competed in the 4000 m team pursuit at the 1960 and 1964 Summer Olympics and finished in fifth and third place, respectively.

Oudkerk was also active in motor-paced racing. After winning the world championships in the amateurs category in 1964 he turned professional and won three more world championship medals, including a gold in 1969.

Oudkerk was the husband of Marianne Heemskerk, a Dutch Olympic swimmer. Jaap Oudkerk died on 17 February 2024, at the age of 86.