The Chamber of Deputies is the lower house of the Congress of the Union, the bicameral parliament of Mexico. The other chamber is the Senate. The structure and responsibilities of both chambers of Congress are defined in Articles 50 to 70 of the constitution.

The Congress of the Union, formally known as the General Congress of the United Mexican States, is the legislature of the federal government of Mexico consisting of two chambers: the Senate of the Republic and the Chamber of Deputies. Its 628 members meet in Mexico City.