Vanhankaupunginselkä (also called "Vanhankaupunginlahti", ) is a bay area which together with parts of adjoining Viikki district constitute a natural conservation zone near downtown Helsinki in the southern part of Finland. The area is listed in Ramsar Convention on Wetlands of International Importance, is part of European Union's Natura 2000 program and is also listed as BirdLife International's Important Bird Area.