The word Primary when used alone may refer to:
- Primary (band), from Australia
- primary circuit, electrical circuit in a Transformer that receives current, as opposed to secondary circuit
- Primary (film), 1960 documentary
- Primary (LDS Church), children's Sunday School organization
- "Primary" (song), by The Cure
- Primary education, the first stage of compulsory education
- Primary Election, Type of election
- Primary Flight Training, in the U.S. Navy
- Primary FRCA, academic examination for anaesthetists in the U.K.
- Primary ideals, a concept in commutative algebra
- Primary Music, Israeli record label
- Primary school, a school providing primary education
- Primary, the oldest period in the Geologic time scale
- "Primary", a song by Spoon from the album Telephono
- Primaries, remiges (wing feathers) in birds
- Primaries or primary beams, in E. E. Smith's science-fiction series Lensman
