Ostara may refer to:
Religion the Old High German word for "Easter", cognate to Anglo-Saxon Ēostre Spring Equinox (Ostara), the Neopagan and Wiccan festival celebrated around spring equinox
Ostara (magazine), a 20th-century German occult and nationalist magazine
Music
Ostara (band), a British folk music band Ostara (album), an album by British band The Wishing Tree
Other
343 Ostara, an asteroid USS Ostara (1944–1946), an American Artemis-class attack cargo ship named after the asteroid Ostara Publishing, a British publisher Ostara Nutrient Recovery Technologies Inc., a Canadian company specializing in resource recovery from wastewater and sewage sludge treatment Ostara, a 20th-century Austrian monarchist organization created by Karl Burian