Vice-Admiral Syed Mohammad Ahsan HQA, SPk, DSO, () (b. 1921 – d. 1989) was a senior three-star admiral who was the 4th Chief of Naval Staff of Pakistan Navy from October 20, 1966 to August 31, 1969. A naval intelligence officer by profession, Vice-Admiral Ahsan was integral to the establishment and expansion of the capabilities of Naval Intelligence and the elite Naval Special Service Group, and took initiatives to modernize the navy. As director-general of Naval Intelligence, Vice-Admiral S.M. Ahsan participated actively in the war and led the Naval intelligence operations during Indo-Pak 1965 September war.