Nahuel Valentini (born 16 November 1988) is an Argentine footballer who plays as a central defender for Italian club Sestri Levante.
On 16 August 2018, he joined Serie B club Ascoli on a one-year contract with one-year extension option.
On 9 September 2020 he signed a 2-year contract with Padova. On 21 January 2021 he was loaned to Serie B club Vicenza.
On 18 August 2023, Valentini joined SPAL on a one-season deal.
On 18 September 2024, Valentini signed with Sestri Levante.