Dimitrovgrad, formerly Melekkes, Melekes, and Melekess until 1972, is a city in Ulyanovsk Oblast, Russia. It is the administrative center of Melekessky District, although it is not within the district and is an independent city. The city is located in the Volga Region, at the confluence of the Melekesska River and the Bolshoy Cheremshan River, a tributary of the Volga River. Dimitrovgrad has a population of 122,580 (2010 Russian census), the second-largest city in Ulyanovsk Oblast, after Ulyanovsk.

Ulyanovsk Oblast is a federal subject of Russia. It is located in the Volga Federal District. Its administrative center is the city of Ulyanovsk. It has a population of 1,292,799.