San Cataldo, September 22, 1955) is a former Sicilian mafioso who became a government informant or "pentito" in 1992.
His testimony led to the arrest of over 200 mafiosi during the so-called "Operation Leopard" (Italian: Operazione Leopardo).
Messina has implicated several politicians and government officials with ties to Sicilian Mafia, in particular Giulio Andreotti, seven times Prime Minister for Italy.