Ward No. 21 Dhaka South City Corporation () is an administrative division of Dhaka South City Corporation Ward, which belongs to Zone-1. It was Ward No. 57 of the former Dhaka City Corporation. Ward No. 21 is located in Dhaka University area of Megacity Dhaka. It forms a city corporation council electoral constituency and is a part of Bangladesh Jatiya Sangsad constituency Dhaka-8.