Seydou Sy (; born 12 December 1995) is a Senegalese association footballer who plays as a goalkeeper.
Club career
Monaco
Sy is a youth exponent from AS Monaco. He made his first team debut on 20 May 2017 in the final Ligue 1 match of Monaco's championship season against Rennes, a 3–2 away win; he started the match and kept a clean sheet before being replaced by fellow debutant Loïc Badiashile at halftime. He and fellow goalkeepers Danijel Subašić and Diego Benaglio were all released in June 2020.
Nacional
On 11 February 2021, Sy signed a short-term contract with Portuguese Primeira Liga strugglers Nacional. On 24 May, after not appearing officially for the club, it was announced that his contract had been terminated, following the Madeira side's relegation to the second tier.