Nawab Bahadur Sir Khwaja Ahsanullah KCIE was the third Nawab of Dhaka. He was notable for his philanthropic works in Bengal, most notably his donations to the present Bangladesh University of Engineering and Technology. He also authored books in Persian and Urdu under the pen name of Shaheen. The palace Ahsan Manzil is named after him by his father Khwaja Abdul Ghani.

The Nawab of Dhaka, originally spelt in English Nawab of Dacca, was the title of the head of one of the largest Muslim zamindar in British Bengal and Assam, based in present-day Dhaka, Bangladesh. The title of nawab, similar to the British peerage, was conferred upon the head of the family by Queen Victoria as a recognition of the first Nawab's loyalty and contribution to the social welfare activities.