C sar Gaviria Trujillo (born March 31, 1947) is a Colombian politician. He served as President of Colombia from 1990 to 1994, and Secretary General of the Organization of American States from 1994 until 2004.

Born in Pereira, Gaviria has been an important figure in Colombian politics. He was first elected to Congress in 1974. He served in Virgilo Barco Vargas's government, first as minister of finance and later as minister of the interior.

He was the debate chief of Luis Carlos Gal n during the later's 1989 presidential campaign, which was cut short by his violent death. After this tragedy, Gaviria was then proclaimed as the political successor to Gal n.

In 1990 he was elected President of the Republic for the Liberal Party. During his government the new constitution was adopted in 1991, and he fought against the Cali drugs cartel and various Colombian guerrilla factions.

In 1994, Gaviria was elected Secretary General of the OAS (his period beginning after the end of his presidential term in August 1994). Reelected in 1999, he has worked extensively on behalf of Latin America; between November 2002 and May 2003, he served as an honest broker in finding a solution to the Venezuelan political crisis between President Hugo Ch vez and the opposition.