A pin-up girl, also known as a pin-up model, is a model whose mass-produced pictures see wide appeal as popular culture. Pin-ups are intended for informal display, e.g. meant to be "pinned-up" on a wall. Pin-up girls may be glamour models, fashion models, or actresses.

The term pin-up may also refer to drawings, paintings, and other illustrations done in emulation of these photos (see the list of pinup artists). The term was first attested to in English in 1941;^[1] however, the practice is...