O 24, laid down K XXIV was an O 21-class submarine of the Royal Netherlands Navy that saw service during World War II.

Following the German invasion of 10 May 1940, O 24 was hastily commissioned, still incomplete, and sailed for England on 13 May, to be finally completed at the Thornycroft shipyard at Southampton.

In March 1941 she joined the 8th Submarine Flotilla at Gibraltar for operations in the Bay of Biscay and Atlantic Ocean, and convoy patrol duties.

[5] In July 1942 O 24 was transferred to the British Eastern Fleet based at Colombo in Ceylon for operations in the Indian Ocean.

[5] O 24 was reduced to the status of training ship in 1947, and was decommissioned in June 1955 to serve as a floating battery until 1958, then as an instruction vessel until 1962 when she was struck, and sold for scrapping the following year.