José de la Cruz Porfirio Díaz Mori (15 September 1830 – 2 July 1915) is a volunteer in the Reform War and then a leader of the successful rebellion against French intervention, an accomplished general and the President of Mexico continuously from 1876 to 1911, with the exception of a brief term in 1876 when he leaves Juan N. Méndez as interim president, and a four-year term served by his political ally Manuel González from 1880 to 1884.

Commonly considered by historians to have been a dictator, he is a controversial figure in Mexican history.

The period of his leadership is marked by significant internal stability (known as the "paz porfiriana"), modernization, and economic growth.

However, Díaz's regime grows unpopular due to repression and political stagnation, and he falls from power during the Mexican Revolution, after he had imprisoned his electoral rival and declared himself the winner of an eighth term in office.

The 35 years in which Díaz rules Mexico are referred to as the Porfiriato.