The Nizamat Imambara, also known as Nizamat Kila, is a grand Shia Muslim congregation hall located in Murshidabad, West Bengal. Built in 1740 by Nawab Siraj ud-Daulah, it was later rebuilt in 1847 by Nawab Mansur Ali Khan after being destroyed by fires in 1842 and 1846.

The present structure is one of the largest imambaras in India and Bengal, standing opposite the Hazarduari Palace by the banks of the Bhagirathi River. The Imambara is renowned for its Islamic architecture, featuring ornate entrances and Quranic text calligraphy.

It serves as a significant religious site, especially during Muharram, when Shia Muslims gather for the solemn commemoration. The building's grandeur and historical significance make it a popular attraction for tourists and history enthusiasts alike.