Princess Principal (Japanese: プリンセス・プリンシパル, Hepburn: Purinsesu Purinshiparu) is a Japanese anime television series produced by Studio 3Hz and Actas. The series was directed by Masaki Tachibana and written by Ichirō Ōkouchi, with original character designs by Kouhaku Kuroboshi and Yukie Akiya, and music by Yuki Kajiura. It was also partly inspired by the American novel The Prince and the Pauper.

Set in a 20th century alternate reality of England, the series follows five young girls enrolled in Queen Mayfair's school serve as undercover spies, working for the Commonwealth to overthrow the Kingdom, which divided London into two.

The series aired from July to September 2017. The first three installments of a six-part sequel film series Princess Principal: Crown Handler have also been released. A mobile game, Princess Principal: Game of Mission, was launched in August 2017, and was available until December 28, 2018.