Grono is a municipality in the Moesa Region in the Italian speaking part of the Swiss canton of Grisons . On 1 January 2017 the former municipalities of Leggia and Verdabbio merged into the municipality of Grono.

Grono is first mentioned in 1219 as de Grono. In 1395 it was mentioned as de Agrono.

Leggia is first mentioned in 1295 as de Legia.

Verdabbio is first mentioned in 1203 as Vertabio.