His son Martin, a journalist for the Mlada Fronta Dnes daily, said Komarek died Thursday in a Prague hospital.
Born Aug. 10, 1930, in the southeast town of Hodonin, Komarek became a Communist Party member after World War II. From 1964-67, he served as an adviser to the Argentine revolutionary Ernesto "Che" Guevara, then minister of industry in Cuba's government.
In the 1980s, Komarek chaired a government economic institute but joined the anti-communist opposition in November 1989. He became one of the most visible faces of the so-called "Velvet Revolution" that ended communist rule in Czechoslovakia.
He also briefly served as deputy premier of the first post-communist government.