Oster may refer to:
Geography Oster, a town in Chernihiv Oblast, Ukraine Oster, Minnesota, an unincorporated community in the United States Oster (river), a tributary of the Desna in Ukraine Oster (Blies), a small river in the Saarland, Germany
Other uses Oster (surname), list of people with the surname , a steam ferry that sailed the fjords near Bergen, Norway from 1908 to 1963 Östers IF (ice hockey) or simply Öster, a defunct Swedish hockey team
See also John Oster Manufacturing Company, a manufacturer of kitchen appliances, popularly known for the Oster Kitchen Center Ostyor, Russia, a former urban-type settlement in Smolensk Oblast, Russia; since 2004—a rural locality