Gusztáv Léderer (July 20, 1893 – November 12, 1926) was a Hungarian army lieutenant and member of Pál Prónay's paramilitary combat unit, and later on, a murderer and possible serial killer. Following the collapse of the Hungarian Soviet Republic, he performed several killings as part of the White Terror, earning a sizeable fortune for himself. Despite this, he continued killing, participating in one of the most scandalous killing of the two World Wars, and possibly others as well.