Emilio Cándido Portes Gil was President of Mexico from 1928 to 1930, one of three to serve out the six-year term of President-elect General Álvaro Obregón, who had been assassinated in 1928. Since the Mexican Constitution of 1917 forbade re-election of a serving president, incumbent President Plutarco Elías Calles could not formally retain the presidency. Portes Gil replaced him, but Calles, the "Jefe Máximo", retained effective political power during what is known as the Maximato.

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.