The "Mexican National Anthem", also known by its incipit "Mexicans, at the cry of war", is the national anthem of Mexico. The lyrics of the national anthem, which allude to historical Mexican military victories in the heat of battle and including cries of defending the homeland, were composed by poet Francisco González Bocanegra after a Federal contest in 1853. Later, in 1854, he asked Jaime Nunó to compose the music that now accompanies González's poem. The national anthem, consisting of ten stanzas and a chorus, effectively entered into use on September 16, 1854.

A national anthem is a patriotic musical composition symbolizing and evoking eulogies of the history and traditions of a country or nation. The majority of national anthems are marches or hymns in style. American, Central Asian, and European nations tend towards more ornate and operatic pieces, while those in the Middle East, Oceania, Africa, and the Caribbean use a more simplistic fanfare. Some countries that are devolved into multiple constituent states have their own official musical compositions for them ; their constituencies' songs are sometimes referred to as national anthems even though they are not sovereign states.