Osmín Aguirre y Salinas (December 25, 1889 – July 17, 1977) was President of El Salvador, from 21 October 1944 to 1 March 1945.
A Colonel in the Salvadoran Army, Aguirre led two successful coups against the Salvadoran government: once in 1931 (installing General Maximiliano Hernández Martínez in power) and again in 1944 (installing himself in power).
He left the power in 1945, with the assurance that his successor in the next election would be Salvador Castaneda Castro.
He was later assassinated near his home in San Salvador at the age of 87.