Trianglen (lit. 'The Triangle') is a central junction and public space in the Østerbro district of Copenhagen, Denmark. Five streets meet in the junction: Blegdamsvej, Øster Allé, Østerbrogade, Nordre Frihavnsgade and Odensegade. Trianglen is a station on the City Circle Line of the Copenhagen Metro.
Lille Trianglen (lit. 'Little Triangle') is located some 400 metres to the south, along Østerbrogade. It is the junction of Østerbrogade, Dag Hammarskjölds Allé, Classensgade, Øster Farimagsgade and Øster Søgade.