Twelfth federal electoral district of Mexico City

The twelfth federal electoral district of Mexico City (Distrito electoral federal 12 de la Ciudad de México; previously "of the Federal District") is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of the 22 currently operational districts in Mexico City.

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. Votes cast in this district also count towards the calculation of proportional representation ("plurinominal") deputies elected from the fourth region.

District territory
Under the 2022 districting plan, which will be used for the 2024, 2027 and 2030 federal elections, the twelfth district covers the bulk of the borough (alcaldía) of Cuauhtémoc. The exception is the northernmost strip, which is assigned to the second district. The 12th district thus covers Mexico City's Centro Histórico.

Previous districting schemes
Under the 2005 districting scheme, the 12th district covered that portion of the borough (delegación) of Cuauhtémoc to the south and east of Paseo de la Reforma and Calzada de Guadalupe.

Between 1996 and 2005, the district covered the southern and western portions of Cuauhtémoc.