Gianmarco De Feo (born 2 June 1994) is an Italian football player who plays for Serie D club Paganese.
He made his Serie C debut for Savona on 6 September 2014 in a game against SPAL.
He was released from his contract with Ascoli by mutual consent on 18 December 2019.
On 31 December 2019, he signed a 2.5-year contract with Serie C club Vis Pesaro.
On 9 February 2022, De Feo signed with Imolese until the end of the season.
On 22 August 2023, De Feo joined Brindisi on a one-season contract.