Kınalıada (Greek: Πρώτη, Proti 'first') is an island in the Sea of Marmara; it is the closest of the Princes' Islands to Istanbul, Turkey, about 12 kilometres (7 mi) south. Administratively, it is a neighbourhood in the Adalar district of Istanbul.

Kınalıada means "Henna Island" in Turkish, as the land has a reddish colour from the iron and copper that has been mined here. This is one of the least forested of the Princes' Islands.

Proti was the island most used as a place of exile under the Byzantine Empire. The most notable exile was emperor Romanos IV Diogenes, after the Battle of Manzikert, 1071.