Gian Marco Crespi (born 28 June 2001) is an Italian professional footballer who plays as a goalkeeper for Serie B club Ascoli.
On 31 January 2020, Crespi signed with Crotone and was loaned back to Gozzano until the end of the 2019–20 season.
On 22 May 2021 he made his serie A debut in Crotone–Fiorentina.
On 2 August 2021 he went to Renate on loan.
On 26 August 2021 he joined Pistoiese on loan.
On 22 July 2022, Crespi was loaned by Picerno.