Senate of the Republic, Senate building on Paseo de la Reforma at Avenida de los Insurgentes, Cuauhtémoc, Mexico City, Mexico

The Senate of the Republic sits at Paseo de la Reforma 135, at its crossing with Avenida de los Insurgentes in the Cuauhtémoc district. Its main block is wrapped in closely spaced horizontal grey metal louvers running corner to corner, with small rectangular glazed openings visible between them and a row of short vertical finials along the flat roofline. A pale, smooth-clad wing stands to the left, and trees and a flagpole stand in front.

The chamber was established in 1824 as part of a bicameral legislature, stopped functioning in 1857, and was reestablished in 1874 with expanded powers. Since then it has worked continuously as the upper house of Mexico's parliament.

Senators serve six-year terms, and since 2018 they may be reelected once for the immediately following period. Each senator belongs to at least three commissions, and the Political Coordination Board, with the coordinators of the parliamentary factions, is the chamber's governing body.

The building stands at Paseo de la Reforma 135, at the crossing with Avenida de los Insurgentes in Cuauhtémoc; the earlier seat was the Antigua Casona de Xicoténcatl in the Centro Histórico. Ordinary sessions run from 1 September to 15 December and from 1 February to 30 April, with recesses between them. The louvered main block faces the avenue, with trees and a flagpole in front.

The parliament is made up of 128 members, with each of the country's 32 states represented by three senators and an additional 32 elected at the national level through proportional representation. This division aims to balance regional and national interests.