Nawabzadi Umdatunnissa Begum (born as Princess Umdat-un-nissa Sultana of Singranatore; 1871-1912) was the queen consort of Nawab Syed Ahmed Hassan of Kharui Raj.

Nawab Begum gave up purdaah and went to the Court of Wards, Calcutta to fight against the arbitrary economic policies introduced by the British, because of which her estate had suffered severe losses.

After the fall of the Mughal Empire in the subcontinent and the expulsion of the imperial royal family to Rangoon and East India, post their defeat at the hands of the British in the 1857 War of Independence; her family's branch remained under cover and took refuge under the Maharaja of Natore and served as Mirdhas (defence minister) of the kingdom, until they assumed the rulership of Singra, which was granted to them as a compensation by the British, after they suppressed the Pabna rebellion in their region in 1871.

When she reached the legal age, she was married off to Nawab Syed Ahmed Hassan of Kharui Raj.

During the late 1880s, the British government introduced a series of economic reforms which aimed at the annexation of territories and exploitation of peasants.