Osmanağa is a neighborhood (mahalle) in the district of Kadıköy, Istanbul, Turkey.
Osmanağa is one of the central neighborhoods of Kadıköy, located at the intersection of important land and sea transportation networks.
It is an area of intense commercial activity, with a much higher number of places of business (9347) than residences (5374).
It also hosts a large number of voluntary associations (dernek).
[1] The neighborhood is bordered on the north by the Kadıköy neighborhoods of Rasimpaşa and Hasanpaşa, on the east by the Kadıköy neighborhood of Zühtüpaşa, on the south by the Kadıköy neighborhood of Caferağa, and on the west by Caferağa and Kadıköy Bay, a part of the Bosporus.