Davide Simoncini (born 30 August 1986) is a Sammarinese footballer who plays as a defender for Sammarinese club Fiorentino.
Simoncini played for A.C. Libertas from 2005 until 2020, when he signed for S.P. Tre Fiori. He has enjoyed success at both clubs, winning the Coppa Titano twice with Libertas.
Simoncini made his debut for San Marino in 2006 in a friendly against Albania, coming on as a substitute. He is La Serenissima's third most capped player and the most capped player still active.
Simoncini and his twin brother, Aldo, both scored an own goal each against Sweden on 7 September 2010, becoming the first twins to accomplish such a feat in an international competition.
He is the twin brother of fellow San Marino international footballer Aldo Junior Simoncini. He works as an accountant.