General elections were held in Mexico on 1 July 2018. Voters elected a new President of Mexico to serve a six-year term, 128 members of the Senate for a period of six years and 500 members of the Chamber of Deputies for a period of three years. It was one of the largest election days in Mexican history, with most of the nation's states holding state and local elections on the same day, including nine governorships, with over 3,400 positions subject to elections at all levels of government. It was the most violent campaign Mexico has experienced in recent history, with 130 political figures killed since September 2017.

The president of Mexico, officially the president of the United Mexican States, is the head of state and head of government of Mexico. Under the Constitution of Mexico, the president heads the executive branch of the federal government and is the commander-in-chief of the Mexican Armed Forces. The current president is Andrés Manuel López Obrador, who took office on 1 December 2018.