Mario Benjamín Menéndez (3 April 1930 – 18 September 2015) was an Argentine military officer. He was a Brigadier General of the Argentine Army. After the 1982 Argentine occupation, he served as Governor of the Falkland Islands from 3 April until 14 June. He surrendered to British forces during the Falkland Wars.
Menéndez was born in Buenos Aires. His brother was Luciano Benjamín Menéndez (1927–2018), a general of the Dirty War.
Menéndez died on 18 September 2015 at the age of 85.