Capital (and largest city) Dhaka 23°42′N 90°21′E ﻿ / ﻿ 23.7°N 90.35°E ﻿ / 23.7; 90.35 Official language(s) Bangla Demonym Bangladeshi Government Unitary state and parliamentary democracy [ 1 ]  -  President Zillur Rahman  -  Prime Minister Sheikh Hasina Wazed  -  Speaker Ad.Abdul Hamid Independence from the Islamic Republic of Pakistan