A Page Three girl is a topless female model whose photographs are published on the third page of The Sun newspaper. In newspaper layout, the third page is directly behind the cover, with page two being on the left-hand side of an open spread. Although the women are sometimes nude, full frontal nudity is never featured. Similar features exist in other newspapers around the world.

The Page Three girl was introduced in 1969 when Rupert Murdoch relaunched The Sun. The Page Three girl was topless for the first time on November 17, 1970, when editor Larry Lamb unveiled the change while Murdoch was out of the country. The first topless model was Stephanie Rahn. The change was credited for a subsequent increase in sales, which rose 40% to 2.1 million copies within a year.

Beverley Goodway was for many years the Page Three photographer. Some consider Page Three to be sexist, demeaning and exploitative. Clare Short, MP for Birmingham Ladywood, led a failed campaign against Page Three girls in 1986. Others, including many Page Three girls, dismiss it as harmless.

During the 1980s and early 1990s, as a response to such criticism, The Sun unveiled a regular 'Page Seven Fellas' feature, featuring scantily clad hunky men. This feature was short lived however.

The writing that accompanies the Page Three girl picture usually explains the model's name, age, where she comes from, and some necessarily brief details of her personality. The models are usually shorter than fashion models, typically under 1.67m (5 ft 6 in) tall and are also usually aged around 18-24.

The Sun eventually instituted a policy where models who obtain breast implants, such as Jordan, are "retired" from Page Three.

Recently, articles accompanying the photos (headed "News in Briefs" by The Sun) attempt to tie in with the news, perhaps for humorous effect, with the models notionally being given a chance to give a comment (which falls into place with the paper's editorial line) on topical items.