Krohn is the surname of several people:
- Lars Monrad-Krohn, a Norwegian engineer
- Kristin Krohn Devold, a Norwegian politician
- Michael Krohn (musician), a Norwegian musician
- Leena Krohn, a Finnish author
- Irina Krohn, a Finnish member of Parliament
- Aino Krohn, a Finnish author better known as Aino Kallas
- Juan María Fernández y Krohn, Catholic priest, would-be assassin
- Kenneth Krohn, co-developer of the Krohn–Rhodes theory
- Ramble John Krohn, an American hip hop producer also known as RJD2
- Tracy Krohn, owner of Krohn Racing/TRG
- August David Krohn, a Russian zoologist
- Julius Krohn, nephew of August, fennoman and folklorist
- Kaarle Krohn, Finnish folklorist, son of Julius
- Katherine Elizabeth Krohn, German-born American author
- Ilmari Krohn, Finnish composer and musicologist, son of Julius
- Felix Krohn, Finnish composer, son of Ilmari
- Jasmin Krohn (b. 1966), Swedish speed skater
- Jonathan Krohn, young American conservative author
- Paysach Krohn, rabbi
- Michael Krohn-Dehli (b. 1983), Danish footballer
- Christine Krohn, a German Federal Court Justice
- Tim Krohn, recipient of the 1994 Conrad-Ferdinand-Meyer-Preis
- Rebecca Krohn, New York City Ballet soloist
- Dankert Krohn (1842–1906), Norwegian businessman active in Portugal with the Krohn Port wine company
- Michael Krohn (1793–1878)
- Hans-Broder Krohn (1915–2009), European politician (Director for Agricultural Economics with the European Commission)
- Henrik Krohn (1826–1879) Norwegian poet, magazine editor and proponent for Nynorsk language.