1846 in Mexico

Events in the year 1846 in Mexico.

Incumbents

 * President – Mariano Paredes
 * President – José Mariano Salas
 * President – Valentín Gómez Farías

Governors

 * Aguascalientes: Felipe Nieto y del Portillo/Felipe Cosio
 * Chiapas: Jerónimo Cardona
 * Chihuahua:
 * Coahuila: Rafael Vázquez/José María de Aguirre González/Santiago Rodríguez del Bosquea
 * Durango:
 * Guanajuato:
 * Guerrero:
 * Jalisco: Antonio Escobedo/Juan Nepomuceno Cumplido/José María Yáñez/Joaquín Angulo
 * State of Mexico:
 * Michoacán:
 * Nuevo León:
 * Oaxaca:
 * Puebla:
 * Querétaro: Julián Juvera
 * San Luis Potosí:
 * Sinaloa:
 * Sonora:
 * Tabasco:
 * Tamaulipas: Juan Martin de la Garza Flores/Manuel Núñez Ponce/Manuel Saldaña/Francisco Vital Fernandez
 * Veracruz: Manuel Gutiérrez Zamora/José de Emparán/Manuel Gutiérrez Zamora
 * Yucatán:
 * Zacatecas:

Events

 * April 25 – Mexican–American War: Open conflict begins over border disputes of Texas' boundaries.
 * May 8 – Mexican–American War – Battle of Palo Alto: Zachary Taylor defeats a Mexican force north of the Rio Grande at Palo Alto, Texas in the first major battle of the war.
 * May 9 – Mexican–American War – Battle of Resaca de la Palma in Brownsville, Texas
 * May 13 – Mexican–American War: The United States declares war on Mexico.
 * June 10 – Mexican–American War: The California Republic declares independence from Mexico.
 * June 14 – Bear Flag Revolt: American settlers in Sonoma, California start a rebellion against Mexico and proclaim the California Republic.
 * July 7 – Acting on instructions from Washington, DC, Commodore
 * August 6 – José Mariano Salas assumed the presidency as provisional president.
 * August 22 – President José Mariano Salas decreed the Mexican Constitution of 1824 in effect again.
 * September 21-24 – Battle of Monterrey