Jahnsson
Jahnsson is a surname. Notable people with the surname include:
- Jean Jahnsson, Swedish jeweller, art collector and Consul General
- Kai Jahnsson, Finnish sport shooter who competes in the men's 10 metre air pistol
- Sirkka Jahnsson or Sirkka Sari, Finnish actress
- Yrjö Jahnsson, Finnish economics professor at the University of Helsinki