Kaartinkaupunki (Swedish: Gardesstaden) is a neighbourhood in the southern part of Helsinki, Finland. Kaartinkaupunki consists of the area between the Esplanadi park and the park. Its area was first confirmed in 1812, but the neighbourhood was only named in 1959. It is neighbourhood number 3 in Helsinki, belonging to the Ullanlinna district and to the Southern main district. Kaartinkaupunki was named after the old Russian army barracks located near . The oldest part of the barracks was built in 1822. It was originally built as a residence for the Helsinki training battalion, which later became the Guard of Finland.