The LXIV Legislature of the Mexican Congress was the meeting of the Mexican Congress of the Union that convened on 1 September 2018 and ended on 31 August 2021. It is composed of the 500 federal deputies and 128 senators elected in the 2018 Mexican general election. While the deputies served only in the LXIV Legislature, the senators, elected to six-year terms, also formed the Senate in the LXV Legislature, which convened in 2021.

The president of the Chamber of Deputies is the presiding officer of the Chamber of Deputies of Mexico. This position is analogous to the speaker of the House in other legislatures. The incumbent president is Marcela Guerra Castillo. The president is elected for a one-year term.