Girolamo Piromalli (October 7, 1918 – February 11, 1979), also known as Mommo, was a historical and charismatic boss of the 'Ndrangheta, a Mafia-type organisation in Calabria (Italy).
His criminal base was his home town Gioia Tauro on the Tyrrhenian coast of Calabria.
He was the capobastone (head of command) of the Piromalli 'ndrina.