Forman's friends had questioned him about his decision to direct "One Flew Over the Cuckoo's Nest", a story they said was "so American" for a foreign director.
His supervisor, Dennis Aspland, confirmed to the Press Affiliation that the filmmaker "handed away late final night time".
His debut as director, Black Peter, about a teenager in his first job, incurred the dislike of the Communist authorities for its irreverent attitude, but after its prizewinning appearance at the Locarno film festival enabled Forman to continue directing.
Born as Jan Tomas Forman in the Czech Republic, February 18, 1932, he moved to the U.S. from his native country for creative pursuits.More news: Kathua rape case: PDP thanks countrymen for supporting Jammu and Kashmir
His other notable work included the rock musical "Hair" in 1979, "Ragtime" in 1981 and "The People vs Larry Flint" in 1996, which was nominated for an Academy Award that year.
In a 2008 interview with the Directors Guild of America, Forman recalls how he, as a newly arrived foreigner, was warned against taking on "One Flew Over the Cuckoo's Nest", as the Ken Kesey novel it was adapted from was deemed to be quintessentially American.
Three years later while Forman was in bed with a fever, the Gestapo intruded again, this time at the family home.
His parents had died in a Nazi concentration camp when he was nine. The film picked up eight Oscars, including Forman's second for Best Director and another Best Picture. However, it took him two years to become a United States citizen. The film starring Jack Nicholson and Louise Fletcher won five Oscars, including best picture and best director. "I was used to seeing the Russian and Czech films about composers, and they were the most boring films", he said.More news: Huey Lewis cancels concerts due to hearing loss
Never prolific, Forman's output slowed even more after Amadeus, and his three subsequent films were disappointments.
A cigar-puffing cycling enthusiast who always retained a heavy accent, Forman was married to actresses Jana Brejchova and Vera Kresadlova.
Man on the Moon, based on the life of cult hero Andy Kaufman, did win its star, Jim Carrey, a Golden Globe. The two had another set of twins, who the director named after Andrew Kaufman and Jim Carrey.More news: Coughing up Game 1 lead shows Capitals' playoff woes still persist