Aldo Junior Simoncini (born August 30, 1986) is a Sammarinese footballer who plays as a goalkeeper for San Marino club A.C. Libertas and San Marino national team.
He won the 2012/13 San Marino International player of the year, and the same title in domestic football in the same season.
Simoncini was signed by Italian club A.C. Cesena in 2011. In January 2012 he was signed by Valenzana in a temporary deal.
Simoncini combined his playing career with working as a accountant.