Samer al-Hajj (died 9 August 2024) was a Palestinian Hamas militant who commanded the Izz ad-Din al-Qassam Brigades in the Ain al-Hilweh refugee camp near Sidon, Lebanon. He was responsible for recruiting and training terrorists to attack Israel during the Israel-Hamas War, and he was killed in an IDF-Shin Bet airstrike in Sidon in August 2024.