Dhaka (Vidhan Sabha constituency) (Hindi: ढाका विधान सभा निर्वाचन क्षेत्र) is an assembly constituency in Purvi Champaran district in the Indian state of Bihar.
As per orders of Delimitation of Parliamentary and Assembly constituencies Order, 2008, 21. Dhaka (Vidhan Sabha constituency) is composed of the following: Dhaka and Ghorasahan community development blocks.
Dhaka (Vidhan Sabha constituency) is part of 4. Sheohar (Lok Sabha constituency).
Election results 
In the November 2010 state assembly elections, Pawan Kumar Jaiswal, Independent, won the 21 Dhaka assembly seat defeating his nearest rival Faisal Rahman of JD(U). Contests in most years were multi cornered but only winners and runners are being mentioned. Awaneesh Kumar Singh of BJP defeated Bhai Pawal Jaiswal of LJP in October 2005 and Nek Mohammad of LJP in February 2005. Manoj Kumar Singh of RJD defeated Awaneesh Kumar Singh of BJP in 2000. Awaneesh Kumar Singh of BJP defeated Motiur Rahman of Congress in 1995 and 1990. Motiur Rahman of Congress defeated Awaneesh Kumar Singh of BJP in 1985 and Prem Shankar Kumar, Independent, in 1980. Siyaram Thakur of Janata Party defeated Hafiz Idris Ansari of Congress in 1977.
Science Tutorial Public School, Dhaka is one of the famous educational institute in dhaka, which is situated in Patel Nagar, Near Post Office & It is founded by Mr. Vikash Gaurav & Mr. Subhash Gaurav.