Gunnarsson is a surname of Icelandic or Swedish origin, meaning son of Gunnar. In Icelandic names, the name is not strictly a surname, but a patronymic. The name refers to:
- Ágúst Ævar Gunnarsson (contemporary), Icelandic post-rock musician
- Aron Gunnarsson (born 1989), Icelandic professional football player playing in England
- Brynjar Gunnarsson (born 1975), Icelandic professional football player
- Carl Gunnarsson (born 1986), Swedish professional ice hockey player
- Daniel Gunnarsson (born 1992), Swedish professional ice hockey player
- Guðmundur Gunnarsson (contemporary), Icelandic labor leader; father of father of Icelandic singer Björk
- Guðmundur Steinn Gunnarsson (born 1982), Icelandic musician and composer
- Gunnar Gunnarsson (1889–1975), Icelandic author
- Gunnar Thor Gunnarsson (born 1985), Icelandic professional football player
- Hermann Gunnarsson (contemporary), Icelandic television and radio personality
- Jan Gunnarsson (born 1962), Swedish tennis player
- Johánnes Gunnarsson (1897–1972), Icelandic Roman Catholic prelate
- Pétur Gunnarsson (born 1947), Icelandic author, poet, and translator
- Rolf Gunnarsson (born 1946), Swedish politician; member of the Riksdag since 1994
- Sturla Gunnarsson (born 1951), Iceland-born Canadian film director
- Susanne Gunnarsson (born 1963), Swedish Olympic canoeist
- Thorarinn Gunnarsson (contemporary), American science-fiction and fantasy author
- Þórhallur Gunnarsson (born 1963), Icelandic actor and television personality
- Veigar Páll Gunnarsson (born 1980), Icelandic professional football player playing in Norway
- Victor Gunnarsson (1953–1993), Swedish extremist suspected in the murder of Swedish prime minister Olof Palme
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