Althoff is a surname. Notable people with the surname include:Althoff (Circus), one of the oldest and greatest Circusfamilies in the world, existing since 1660 Ernie Althoff, an Australian musician Friedrich Althoff (1839–1908), Prussian Minister of Culture Adolf & Maria Althoff, Owner of a German Althoff-Circus, Righteous Among the Nations Kai Althoff, German painter Pamela Althoff, a Republican Illinois State Senator William Althoff, principal of St. Vincent's High School in 1883
