| Honorific Prefix: | General |
| Gilles Andriamahazo | |
| Office: | Chairman of the National Military Leadership Committee |
| Predecessor: | Richard Ratsimandrava (as Minister of the Interior) |
| Successor: | Didier Ratsiraka (as President of Madagascar) |
| Birth Date: | 5 May 1919 |
| Birth Place: | Fort Dauphin, Anosy, French Madagascar |
| Death Place: | Antananarivo, Democratic Republic of Madagascar |
| Death Cause: | Heart attack |
General Gilles Andriamahazo (5 May 1919 – 13 September 1989) was a Malagasy general and political figure. He served as the head of state of Madagascar (Chairman of the National Military Leadership Committee) between 12 February and 15 June 1975.
Born in Fort Dauphin, Anosy Region on 13 May[1] 1919, he followed a military career. During World War II Andriamahazo served in the French Army and participated in the French military campaign against Algerian nationalists in the 1950s. He retired as an army officer in 1976.
He was the successor of Richard Ratsimandrava after the latter's assassination. He served as head of state from 12 February to 15 June 1975, when he resigned in favour of Didier Ratsiraka. He is widely credited with having prevented an outbreak of civil war during the tension that followed Colonel Ratsimandrava's assassination. He died of a heart attack at the age of 70, on 14 September 1989.[2]