Tonami is a city in Toyama Prefecture, Japan. As of 31 March 2018, the city had an estimated population of 48,659 in 16,739 households and a population density of 384 persons per km2. Its total area was 127.03 square kilometres (49.05 sq mi).

Toyama Prefecture is a prefecture of Japan located in the Chūbu region of Honshu. Toyama Prefecture has a population of 1,044,588 and has a geographic area of 4,247.61 km2. Toyama Prefecture borders Ishikawa Prefecture to the west, Gifu Prefecture to the south, Nagano Prefecture to the east, and Niigata Prefecture to the northeast.