A
- Allan Karlsson (skier) (1911–1991), Swedish cross country skier
- Allan Karlsson (footballer), Swedish former footballer
- Anders Carlsson (politician) (born 1951), Swedish social democratic politician
- Anders Karlsson (physicist) (born 1964), Swedish physicist
- Andreas Karlsson (born 1975), Swedish ice hockey player
- Arne Karlsson (born 1936), Swedish sailboat racer
- Arvid Carlsson (born 1923), Swedish neuroscientist, Nobel Prize in 2000
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