Tatsunokuchi (辰口町; -machi) was a town located in Nomi District, Ishikawa, Japan.
On February 1, 2005 Tatsunokuchi was merged with the towns of Neagari and Terai, all from Nomi District, to form the new city of Nomi and no longer exists as an independent municipality.
As of 2003, the town had an estimated population of 14,804 and a density of 259.13 persons per km². The total area was 57.13 km².