2021 Mexican legislative election

Legislative elections were held in Mexico on 6 June 2021. Voters elected 500 deputies (300 in single-member constituencies by first-past-the-post and 200 by proportional representation) to sit in the Chamber of Deputies for the 65th Congress. These elections took place concurrently with the country's state elections.

On 5 December 2020, the National Action Party, the Institutional Revolutionary Party and the Party of the Democratic Revolution announced an electoral alliance, Va por México ("Go For Mexico"). Morena, the Labour Party and the Ecologist Green Party of Mexico formed the Juntos Hacemos Historia (″Together we make history″) coalition. Both alliances were approved by the National Electoral Institute (INE).

The INE issued a statement on 3 February 2021 saying that it would not be prudent to postpone the election because of the COVID-19 pandemic and doing so could even trigger a constitutional crisis by delaying the opening of the 65th Congress. INE board president Lorenzo Córdova Vianello noted the successful elections in Hidalgo and Coahuila in October 2020.

On 13 April 2021, the INE canceled the registrations of Manuel Guillermo Chapman (Morena), Ana Elizabeth Ayala Leyva, (Juntos Haremos Historia), and Raúl Tadeo Nava (Labor Party) for failure to certify their lack of involvement in gender violence. On 3 June, the INE warned about possible sanctions on Catholic bishops, in particular Juan Sandoval Íñiguez, for their interference in the elections.

The elections were Mexico's largest in history and were tainted by several political assassinations and the COVID-19 pandemic in Mexico.