Dahlgren guns were muzzle-loading naval gun designed by a United States Navy Rear Admiral John A. Dahlgren (November 13, 1809 – July 12, 1870), mostly used in the American Civil War.

The United States Naval Surface Warfare Center Dahlgren Division, named for Rear Admiral John A. Dahlgren, is located in King George County, Virginia, in close proximity to the largest fleet concentration area in the Navy.

John Adolphus Bernard Dahlgren (November 13, 1809 – July 12, 1870) was a United States Navy officer who founded his service's Ordnance Department and launched significant advances in gunnery.

Eva Charlotte Dahlgren (born 9 June 1960) is a Swedish pop musician and singer-songwriter.

Rolf Martin Theodor Dahlgren (7 July 1932 – 14 February 1987) was a Swedish-Danish botanist and professor at the University of Copenhagen from 1973 to his death.

an American actor, singer, guitarist and music producer.

(April 3, 1842 – March 2, 1864) an American military officer who served as colonel in the Union Army during the American Civil War.