Mattia Proietti (born 27 February 1992) is an Italian football player who plays as a midfielder for club Ternana.
He made his Serie C debut for Bassano on 4 September 2011 in a game against Virtus Lanciano.
On 10 July 2019, he signed a 3-year contract with Ternana.
On 8 September 2023, Proietti moved to Casertana.
On 23 July 2024, Proietti joined Gubbio.