Dimitrovgrad, city, eastern Ulyanovsk oblast (region), western Russia. The city is situated at the confluence of the Melekes and Bolshoy (Great) Cheremshan rivers.
It was founded in 1714 and became a town in 1919. It is an agricultural processing centre, with sawmilling and metalworking industries, and it also has an atomic research centre. A teacher-training college is located in the city. Pop. (2010) 122,580; (2014 est.) 118,513.