Yes, according to Marvel canon, Iron Man (Tony Stark) is dead.
Tony Stark sacrificed his life to defeat Thanos and save the universe. This sacrifice occurred during the final battle against Thanos in Avengers: Endgame. By using the Infinity Stones to eliminate Thanos and his army, he sustained fatal injuries. As of October 17, 2024, it marks the one-year anniversary of his heroic death within the Marvel Cinematic Universe timeline.
