The Second Federal Electoral District of Aguascalientes is one of the 300 Electoral Districts into which Mexico is divided for the purpose of elections to the federal Chamber of Deputies and one of three such districts in the state of Aguascalientes. It elects one deputy to the lower house of Congress for each three-year legislative period, by means of the first past the post system. Under the 2005 redistricting process, it is made up of the eastern portion of the municipality of Aguascalientes.