Jahnsson

Jahnsson is a surname. Notable people with the surname include:


 * Jean Jahnsson (1854–1944), Swedish jeweller, art collector and Consul General
 * Kai Jahnsson (born 1965), Finnish sport shooter who competes in the men's 10 metre air pistol
 * Sirkka Jahnsson or Sirkka Sari (1920–1939), Finnish actress
 * Yrjö Jahnsson (1877–1936), Finnish economics professor at the University of Helsinki