The City of the Sun is a philosophical work by the Italian Dominican philosopher Tommaso Campanella. It is an important early utopian work. The work was written in Italian in 1602, shortly after Campanella's imprisonment for heresy and sedition. A Latin version was written in 1613–14 and published in Frankfurt in 1623.

Tommaso Campanella, baptized Giovanni Domenico Campanella, was an Italian Dominican friar, philosopher, theologian, astrologer, and poet.