Ostara (disambiguation)

Ostara may refer to:
 * the Old High German for "Easter", cognate to Anglo-Saxon Ēostre
 * Spring Equinox (Ostara), the Neopagan and Wiccan festival celebrated around spring equinox
 * The asteroid 343 Ostara
 * The American Artemis class attack cargo ship USS Ostara (1944–1946), named after the asteroid
 * Ostara (magazine), a 20th-century occult publication of Lanz von Liebenfels
 * Ostara (band), a neo-folk musical group
 * Ostara (album), an album by The Wishing Tree
 * Ostara Publishing, a British publisher
 * Ostara Nutrient Recovery Technologies Inc., a Canadian company specializing in resource recovery from wastewater and sewage sludge treatment