Tijuana Municipality is a municipality in the Mexican state of Baja California. Its municipal seat is located in the city of Tijuana. According to the 2010 census, the municipality had a population of 1,559,683 inhabitants, of whom 1,300,983, or 83.4%, lived in the city of Tijuana. The municipality maintained its position as 3rd most populated nationally as of 2015 census, only behind Ecatepec de Morelos and Iztapalapa (a Mexico City borough).Carlos Bustamante Anchondo of the PRI is the current municipal president. The municipality comprises the largest part of the Tijuana metropolitan area.

Tijuana is bordered to the south by the municipalities of Rosarito Beach and Ensenada; to the east, by the municipality of Tecate; to the west, by the Pacific Ocean; and to the north, by the international border with the United States, specifically the County of San Diego, California. The area of the municipality of Tijuana is 879.2 km² (339.46 sq mi); the municipality includes part of the Coronado Islands, located off the coast of the municipality in the Pacific Ocean.

The city of Tijuana's precise location is 32°32′05″N 117°02′37″W / 32.53472°N 117.04361°W / 32.53472; -117.04361. It lies just south of San Diego, California. The adjacent city and former borough of Tijuana is Rosarito Beach.