The twelfth federal electoral district of Chiapas (Distrito electoral federal 12 de Chiapas) is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of 13 such districts in the state of Chiapas.

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 third region. ^{[1] [2]}

The twelfth district of Chiapas was created in 1996. Between 1979 and 1996, the state had only nine congressional districts; the 1996 redistricting process increased the number to 12. ^[3] The three new districts elected their first deputies, to the 57th Congress, in the 1997 mid-terms.

Under the 2022 districting plan, which will be used for the 2024, 2027 and 2030 federal elections, ^[4] the 12th district comprises seven municipalities in the extreme south of the state:

• Cacahoatán, Frontera Hidalgo, Metapa, Suchiate, Tapachula, Tuxtla Chico and Unión Juárez. ^[5]

The district's head town (cabecera distrital), where results from individual polling stations are gathered together and collated, is the city of Tapachula. ^[6]

2017–2022

From 2017 to 2022 the district had same composition as in the 2017 plan. ^[7]

2005–2017

The district was located in the same basic region but comprised the municipalities of Frontera Hidalgo, Metapa, Suchiate, Tuxtla Chico and three-quarters of the municipality of Tapachula (the northern quarter was in the 11th district). The district's head town was the city of Tapachula. ^[8]

1996–2005

Between 1996 and 2005, the district had a different configuration: it covered the municipality of Tapachula in its entirety, together with Cacahoatán and Unión Juárez, in addition to the others that it covered between 2005 and 2017. ^[9]

National parties
Current
	PAN
	PRI
	PT
	PVEM
	MC
	Morena
Defunct or local only
	PLM
	PNR
	PRM
	PPS
	PARM
	PFCRN
	Convergencia
	PANAL
	PSD
	PES
	PRD

Twelfth federal electoral district of Chiapas

Election	Deputy	Party	Legislature	Term
1997	Ranulfo Tonche Pacheco [10]		57th Congress	1997–2000
2000	Adolfo Zamora Cruz [11]		58th Congress	2000–2003
2003	Carlos Pano Becerra [12]		59th Congress	2003–2006
2006	Antonio de Jesús Díaz Athié [13]		60th Congress	2006–2009
2009	Sami David David [14]		61st Congress	2009–2012
2012	Antonio de Jesús Díaz Athié [15]		62nd Congress	2012–2015
2015	Samuel Alexis Chacón Morales [16]		63rd Congress	2015–2018
2018	José Luis Elorza Flores [17]		64th Congress	2018–2021
2021	José Luis Elorza Flores [18]		65th Congress	2021–2024
2024	Rosa Irene Urbina Castañeda [19]		66th Congress	2024–2027

14°54′N 92°16′W / 14.900°N 92.267°W / 14.900; -92.267