- any of numerous American finches of the family Emberizinae.
- any member of the Old World genus Passer, formerly thought to be closely related to the weaverbirds but now placed in their own family, Passeridae.
- the house sparrow.
- any of several other unrelated small birds.
- a 12-foot (4-meter), all-weather, radar-guided U.S. air-to-air missile with an 88-pound (40-kilogram) high-explosive warhead.
- any weaverbird of the genus Passer and related genera, esp the house sparrow, having a brown or grey plumage and feeding on seeds or insects
- any of various North American finches, such as the chipping sparrow (Spizella passerina), that have a dullish streaked plumage
