Ahlberg or Åhlberg is a surname. Notable people with the surname include:
- Alf Ahlberg (1892–1979), Swedish writer, humanist and philosopher
- Bruno Ahlberg (1911–1966), Finnish boxer
- Flemming Ahlberg (born 1946), Danish footballer
- Gillis Ahlberg (1892–1930), Swedish rower
- Hakon Ahlberg (1891–1984), Swedish architect, editor and author
- Janet and Allan Ahlberg (born 1944 and 1938), British children's book illustrator and writer, commonly as a married duo
- Jessica Ahlberg (born 1979 or 1980), British children's book illustrator and writer, sometimes in collaboration with her father
- Mac Ahlberg (born 1931), Swedish film director and cinematographer
- Mats Åhlberg (born 1947), Swedish ice hockey player
- Per E. Ahlberg, Swedish vertebrate palaentologist
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