Pedro Lascuráin becomes President of Mexico for 45 minutes; this is the shortest term to date of any person as president of any country.

Pedro José Domingo de la Calzada Manuel María Lascuráin Paredes was a Mexican politician and lawyer who served as the 38th president of Mexico for 45 minutes on 19 February 1913, the shortest presidency in history. The grandson of Mariano Paredes, the 15th president of Mexico, Lascuráin previously served as Mexico's foreign secretary for two terms and was the director of a small law school in Mexico City for 16 years.

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 office, which was first established by the federal Constitution of 1824, is currently held by Claudia Sheinbaum, who was sworn in on October 1, 2024. The office of the president is considered to be revolutionary, in the sense that the powers of office are derived from the Revolutionary Constitution of 1917. Another legacy of the Mexican Revolution is the Constitution's ban on re-election. Mexican presidents are limited to a single six-year term, called a sexenio. No one who has held the post, even on a caretaker basis, is allowed to run or serve again. The constitution and the office of the president closely follow the presidential system of government.