Aleida March Torres (born 19 October 1936) is a Cuban revolutionary who is the widow of Ernesto 'Che' Guevara's and a member of Fidel Castro's Cuban army.

March was an active combatant in Che Guevara's Lightning Campaign in December 1958. She was present at the battle for Las Villas in which Column 8 of the 26th of July Movement was ordered by Castro to paralyze the occupying military forces of President Fulgencio Batista in the province.

Her marriage to Guevara is reported to have happened both on 23 March 1959 and 2 June 1959, after his divorce from Hilda Gadea. A civil ceremony was held at La Cabaña military fortress. After the 2 June marriage, Guevara and Aleida honeymooned at Tarara, a seaside resort town 20 kilometers from Havana. The couple had four children together: Aleida, Camilo, Celia, and Ernesto.