Cajetan and Kajetan is the Anglicized, Germanized and Slavicized form of the Italian given name Gaetano. People with this name include:
- Thomas Cajetan (1469–1534), Italian Dominican theologian, cardinal, and opponent of Martin Luther
- Saint Cajetan (Gaetano dei Conti di Thiene; 1480–1547), canonized saint
- Constantino Cajetan (1560–1650), Italian Benedictine scholar
- Cajetan Tschink (1763–1813), Austrian writer and philosopher
- Baron Cajetan von Felder (1814–1894), Austrian lawyer, entomologist and liberal politician
- Karl Kajetan von Gaisruck (1769–1846), Austrian archbishop
- Kajetan Garbiński (1796–1847), Polish mathematician
- Josef Kajetán Tyl (1808–1856), Czech dramatist and author of lyrics of the Czech anthem
- Cajetan, pseudonym of the Austrian physician and illustrator Anton Elfinger (1821–1864)
- Kajetan von Mérey (1861–1931), Austro-Hungarian diplomat
- Kajetan Stefanowicz (1886–1920), Polish Art-Nouveau painter and illustrator
- Kajetan Mühlmann (1898–1958), Austrian art historian and officer in the SS
- Cajetan J. B. Baumann (1899–1969), Franciscan architect
- Kajetan Kovič (1931–2014), Slovene poet, writer, translator, and journalist
- Kajetan Duszyński (born 1995), Polish sprinter
- A fictional character in Kajetan a modra liska