Russian media reported the writer's son Stepan said Solzhenitsyn, who had been ill for years, died at his Moscow-area home of either a stroke or heart failure, the BBC said.
Solzhenitsyn, who wrote "One Day in the Life of Ivan Denisovich," was awarded a Nobel Prize for literature in 1970. He was exiled in 1974 and didn't return until 1994.
Solzhenitsyn, a decorated Soviet artillery officer in World War II, nonetheless was denounced for criticizing Soviet leader Josef Stalin in a letter, the British network noted. He spent eight years in a prison, or gulag, before being exiled to Kazakhstan.