Toyohashi is a city in Aichi Prefecture, Japan. As of 1 December 2019, the city had an estimated population of 377,453 in 160,516 households and a population density of 1,400 persons per km2. The total area of the city was 261.86 square kilometres (101.10 sq mi). By area, Toyohashi was Aichi Prefecture's second-largest city until March 31, 2005 when it was surpassed by the city of Toyota, which had merged with six peripheral municipalities.

Aichi Prefecture is a prefecture of Japan located in the Chūbu region of Honshū. Aichi Prefecture has a population of 7,552,873 and a geographic area of 5,172.92 square kilometres (1,997.28 sq mi) with a population density of 1,460 inhabitants per square kilometre (3,800/sq mi). Aichi Prefecture borders Mie Prefecture to the west, Gifu Prefecture and Nagano Prefecture to the north, and Shizuoka Prefecture to the east. Nagoya is the capital and largest city of the prefecture.