Masjid-e-Siraj ud-Daulah, Religious monument in Chittagong, Bangladesh.

Masjid-e-Siraj ud-Daulah, also called Chandanpura Mosque, stands on the west side of Nawab Siraj ud-Daulah Road in Chawkbazar Ward, opposite the two-storey red brick Fire Brigade Station Chandanpura. The mosque has fifteen domes; the largest was made using 15 maunds of silver and brass worth about four lakh taka at the time, collected from various places in India. The names of Muhammad's family and the ten Companions given the glad tidings of paradise are written around the domes.

Construction began in 1870 under contractor Master Abdul Hamid with architects and builders from Lucknow and Bombay. The structure underwent major renovations in 1952, initiated by Abu Syed Dobhash, a descendant of the original contractor.

The mosque is also called Chandanpura Taj Mosque and Hamidia Taj Masjid, after its original name. Its largest dome was made using 15 maunds of silver and brass, bought for about four lakh taka at the time and collected from various parts of India. Around the domes are written the names of Muhammad's family and the ten companions promised paradise.

The mosque sits on the west side of Nawab Siraj ud-Daulah Road in Chawkbazar Ward, opposite the two-storey red brick Fire Brigade Station Chandanpura, which helps visitors locate the entrance. It remains an active prayer space, so non-worshippers should time a look at the exterior and domes outside prayer times and dress modestly.

The largest of the mosque's fifteen domes was made using about 15 maunds of silver and brass, bought for roughly four hundred thousand taka of the time and collected from various places in India. The names of Muhammad's family and the ten Companions promised paradise are written around the domes.