Ağva is a populated place and resort destination in the Şile district of İstanbul Province, Turkey.
The area around AÄŸva was a part of ancient Bithynia. During the Ottoman era, Turkmen people were settled around AÄŸva. Up to 20th century, a sizable Greek population also dwelled in AÄŸva. However, according to population exchange between Greece and Turkey agreement in the 1920s, they were replaced by Turks from Greece.