A pinafore is a sleeveless garment worn as an apron.
Pinafore may also refer to: Pinafore dress, sleeveless, collarless dress intended to be worn over a blouse, shirt or sweater Pinaforing, forced cross-dressing for erotic purposes H.M.S. Pinafore, Gilbert and Sullivan opera USS Pinafore (SP-450), United States Navy launch in commission from 1902 to 1920 Pinafore (software), a web client for Mastodon (software) designed for speed and simplicity