Dahlgren is a Swedish surname. Notable people with the surname include:
Anders Dahlgren (1925–1986), Swedish politician who was a member of the Centre Party
Charles G. Dahlgren (1811–1888), Confederate brigadier general during the American Civil War
Cornelia Dahlgren, Swedish singer and songwriter
Dagmar Dahlgren (1880–1951), American singer and silent film era motion picture actress
Babe Dahlgren (1912–1996), American baseball player
Edward C. Dahlgren (1916–2006), United States Army soldier
Eva Dahlgren (born 1960), Swedish singer
Fredrik August Dahlgren (1816–1895) Swedish writer, playwright and songwriter
George Dahlgren (1887–1940), player in the National Football League
Gertrud Dahlgren (1931–2009), Swedish botanist
Jay Dahlgren (born 1948), Canadian javelin thrower
Jeff Dahlgren, American guitarist and producer
Jennifer Dahlgren (born 1984), Argentinian athlete
John A. Dahlgren (1809–1870), Rear Admiral, U.S. Navy officer
John Olof Dahlgren (1872–1963), American Medal of Honor recipient
Karl Fredrik Dahlgren (1791–1844), Swedish poet
Kristen Dahlgren, American NBC reporter
Leif Dahlgren (1906–1998), Swedish decathlete
Mathias Dahlgren (born 1969), Swedish chef, who won the culinary championship Bocuse d'Or in 1997
Mikael Dahlgren (born 1984), Swedish footballer who currently plays for Landskrona BoIS
Robert Dahlgren (born 1979), Swedish auto racing driver
Rolf Dahlgren (1932–1987), Swedish-Danish botanist
Tom Dahlgren (born 1933), American actor
Ulric Dahlgren (1842–1864), Colonel, U.S. Army officer
Sara Dahlgren (born 1980), Swedish singer and actress
