Udham Singh Nagar district is a district of Uttarakhand state in northern India. Rudrapur is the district headquarters. This district consists of seven Tehsils named Bajpur, Gadarpur, Jaspur, Kashipur, Kichha, Khatima, Sitarganj. The district is located in the Terai region, and is part of Kumaon Division. It is bounded on the north by Nainital District, on the northeast by Champawat District, on the east by Nepal, and on the south and west by Uttar Pradesh state. The district was created in October 1995 out of Nainital District, and is named for Udham Singh.
As of 2011 it is the third most populous district of Uttarakhand (out of 13), after Haridwar and Dehradun.
G.B. Pant University, noted for its engineers & agriculture scientists, is located 5 km from Rudrapur
