Rear Admiral Jacob Andries Cornelius 'Jaap' Weideman SM MMM (1936–1996) was a South African Navy officer.

He joined the Navy in 1954 and in 1955 attended the South African Military Academy.

[1]: 196 In 1970 he became the first South African to qualify as a submariner and became the first Officer Commanding of SAS Maria van Riebeeck.

[2] In 1982 he was appointed as Inspector General (Navy).

This biographical article related to the South African military is a stub.