Troyat, whose last book was published in 2006, had written more than 100 works of fiction, history and biography, the BBC said.
At the time of his death, he was dean of the Academie Francaise.
Toyat was born in Russia but his family fled the Russian revolution and eventually settled in Paris, the BBC said. He won his first literary award, le prix du roman populaire, at age 24; at 27 he was awarded the Prix Goncourt.
His biographies of writers and monarchs included Anton Chekov, Catherine the Great, Rasputin, Ivan the Terrible and Leo Tolstoy.