Girolamo Piromalli, also known as Mommo, was an Italian mobster and member of the 'Ndrangheta. He was capobastone of the Piromalli 'ndrina based in his home town Gioia Tauro on the Tyrrhenian coast of Calabria.

The Piromalli 'ndrina is one of the most powerful clans of the 'Ndrangheta, a criminal and mafia-type organisation in Calabria, Italy. The 'ndrina is based in Gioia Tauro on the Tyrrhenian coast. The Piromalli's are allied with their relatives of the Molè family, also from Gioia Tauro. Often they are referred to as the Piromalli-Molè clan. The Piromalli clan contains more than 200 members.