Mortensen or Mortenson (in US) is a surname of Danish and Norwegian origin, meaning son of Morten. The Swedish variant is Mårtensson. Mortensen is currently the 20th most common surname in Denmark.
It may refer to the following people:
Arne Mortensen (1900–1942), Norwegian rowerBeverly Mortensen, American musician and composerCarlos Mortensen (born 1972), professional poker from EcuadorChristian Mortensen (1882–1998), Danish-American supercentenarianChris Mortensen (born 1951), American journalistDale T. Mortensen (1939–2014), American economistFinn Mortensen (1922–1983), Norwegian classical composerGreg Mortenson (born 1957), American humanitarianHans Christian Cornelius Mortensen (1856–1921), Danish teacher and ornithologistJess Mortensen (1907–1962), American NCAA champion track athlete and coachMalene Mortensen (born 1982), Danish singerOle Mortensen (born 1958), Danish cricketerOle Theodor Jensen Mortensen (1868–1952), Danish professor of zoologyScott Mortensen, American politicianStan Mortensen (1921–1991), English professional footballerViggo Mortensen (born 1958), Danish-American actor, poet, musician, photographer and painterMarilyn Monroe (1926–1962), born Norma Jeane Mortenson