Jonassen

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


 * Emil Jonassen (born 1993), Norwegian football player
 * Fartein Døvle Jonassen (born 1971), Norwegian novelist and translator
 * Hagbard Jonassen (1903–1977), Danish botanist, quaternary geologist, war resister and nuclear disarmament proponent
 * Kenneth Jonassen (born 1974), male badminton player from Denmark
 * Vitus Jonassen Bering or Vitus Bering (1681–1741), Danish-born navigator in the service of the Russian Navy