Johannsen
Johannsen is a surname. Notable people with the surname include:
- Anton Johannsen, German-American labor militant
- Franz Johannsen, German sprint canoeist
- Gunnar Johannsen, German cyberneticist, and Professor of Systems Engineering and Human-Machine Systems
- Hans Johannsen, German chief engineer on a U-boat in World War II
- Helmuth Johannsen, German football coach
- Jake Johannsen, American comedian
- Kristoffer Johannsen, Danish former professional football player
- Kurt Johannsen (bush mechanic), Australian mechanic
- Kyle Johannsen, Canadian philosopher
- Nicholas Johannsen, German-American amateur economist
- Oskar Augustus Johannsen, American entomologist, specialist of Diptera
- Wilhelm Johannsen, Danish botanist, plant physiologist and geneticist