Aust is a surname. Notable people with the surname include:
Abner M. Aust (1921–2020), American air force officer Charlie Aust (1942–2017), Rhodesian army officer Dennis Aust, (born 1940), American baseball player Kurt Aust (born 1955), Danish writer Otto Aust (1892–1943), Swedish sailor René Aust (born 1987), German politician Stefan Aust (born 1946), German journalist