Brita Christina Hagberg, née Nilsdotter, alias Petter Hagberg, (1756-dead in Stockholm 19 March 1825), was a woman who served as a soldier in the Swedish army during the Russo-Swedish War (1788-1790). She is one of two confirmed women to have been decorated for bravery in battle in Sweden before women were allowed into the military in the 20th century. Brita Hagberg was later in her service wounded in battle at Björkö Sund, and was ordered to go below deck to have wounds tended to. She was unwilling, but was forced to obey this order, and thus, her gender was revealed.