Tonshayevo is an urban locality situated in the Tonshayevsky District of the Nizhny Novgorod Oblast in Russia. It serves as a residential and administrative point within this region.
According to census data, the population of the locality has remained relatively stable over several decades. The 2010 census recorded a population of 4,570 residents, following figures of 4,432 in 2002 and 4,394 during the 1989 Soviet census.