The Mexican Federal Army, also known as the Federales in popular culture, was the military of Mexico from 1876 to 1914 during the Porfiriato, the long rule of President Porfirio Díaz, and during the presidencies of Francisco I. Madero and Victoriano Huerta. Under President Díaz, a military hero against the French Intervention in Mexico, the Federal Army was composed of senior officers who had served in long ago conflicts. At the time of the outbreak of the Mexican Revolution most were old men and incapable of leading men on the battlefield. When the rebellions broke out against Díaz following fraudulent elections of 1910, the Federal Army was incapable of responding. Although revolutionary fighters helped bring Francisco I. Madero to power, Madero retained the Federal Army rather than the revolutionaries. Madero used the Federal Army to suppress rebellions against his government by Pascual Orozco and Emiliano Zapata. Madero placed General Victoriano Huerta as interim commander of the military during the Ten Tragic Days of February 1913 to defend his government. Huerta changed sides and ousted Madero's government. Rebellions broke out against Huerta's regime. When revolutionary armies succeeded in ousting Huerta in July 1914, the Federal Army ceased to exist as an entity, with the signing of the Teoloyucan Treaties.

José de la Cruz Porfirio Díaz Mori, known as Porfirio Díaz, was a Mexican general, politician, and later dictator who served seven terms as President of Mexico, a total of 35 years, from 28 November 1876 to 6 December 1876, 17 February 1877 to 1 December 1880, and 1 December 1884 to 25 May 1911. The entire period from 1876 to 1911 is often referred to as the Porfiriato, and has been characterized as a de facto dictatorship.