Riotorto is a town in Tuscany, central Italy, administratively a frazione of the comune of Piombino, province of Livorno. At the time of the 2011 census its population was 1,445.

A frazione is a type of subdivision of a comune in Italy, often a small village or hamlet outside the main town, similar to a suburb or exurb. Most frazioni were created during the Fascist era as a wa