Twenty-first federal electoral district of Veracruz

The twenty-first federal electoral district of Veracruz (Distrito electoral federal 21 de Veracruz) is a defunct federal electoral district of the Mexican state of Veracruz.

During its existence, the 21st district returned one deputy to the Chamber of Deputies for each of the 51st to 63rd sessions of Congress. Votes cast in this district also counted towards the calculation of proportional representation ("plurinominal") deputies elected from the third region.

Created as part of the 1977 political reforms, it was first contested in the 1979 mid-term election and it elected its last deputy in the 2015 mid-terms. It was dissolved in 2017 because the state's population no longer warranted 21 districts.

Territory
In its final form, the 21st district's head town (cabecera distrital), where results from individual polling stations were gathered together and collated, was the city of Cosoleacaque. It covered 11 municipalities in the state's southernmost Olmeca region: Cosoleacaque, Chinameca, Hueyapan de Ocampo, Jáltipan, Mecayapan, Oluta, Oteapan, Pajapan, Soconusco, Soteapan, Texistepec, Tatahuicapan de Juárez and Zaragoza.
 * 2005–2017

Under the 1996 districting plan, the district's head town was at Cosoleacaque.
 * 1996–2005

The districting scheme in force from 1978 to 1996 was the result of the 1977 electoral reforms, which increased the number of single-member seats in the Chamber of Deputies from 196 to 300. Under that plan, Veracruz's seat allocation rose from 15 to 23. The newly created 21st district had its head town at the city of Veracruz, and it covered a part of the city and the rural areas of the municipality of Veracruz.
 * 1978–1996