Gabriel León Trilla (3 August 1899 – 6 September 1945) was a Spanish communist leader who was one of the founders of the Spanish Communist Party while in exile in Paris in the 1920s.
He was expelled from the party in 1932 for supporting the Republican government, but was readmitted at the start of the Spanish Civil War (1936–39).
During World War II (1939–45) he helped organize Spanish refugees in Spain as members of the French Resistance, then moved to Spain where he ran an underground newspaper.
He was assassinated in 1945 on orders of the Communist Party of Spain on the grounds that his independent actions had endangered other communists.