Bjørnson is a Norwegian surname with the literal meaning "Son of Bjørn". Bjornson, Bjørnson, Bjørnsen, Björnsson and variations can refer to the following people:
- Icelanders
- Norwegians
- Bjørnstjerne Bjørnson (1832-1910), Norwegian writer and a 1903 Nobel Prize in Literature laureate
- Bjørn Bjørnson (1859-1942), Norwegian stage actor and theatre director, son of Bjørnstjerne Bjørnson
- Gudrød Bjørnsson, Norwegian politician in Middle Ages, grandfather of Saint Olaf
- Ivar Bjørnson (born 1977), Norwegian musician in Black Metal band Enslaved
- Øyvind Bjørnson, (1950–2007) was Norwegian historian
- Swedes
- Other nationalities
- Craig Bjornson (born 1969), American baseball coach
- David Bjornson (born 1947), Canadian politician
- Eric Bjornson (born 1971), American football player
- Karen Bjornson (born 1952), American model
- Maria Björnson (1949-2002), French theatre stage designer
- Mette Koefoed Bjørnsen (1920–2008), Danish author, conciliator and economist
- Oscar Bjornson (1906-1972), Canadian politician
- Peter Bjornson, Canadian politician
- Rosella Bjornson (born 1947), Canadian airline pilot
- Val Bjornson (1906-1987), American politician