Welle Ossou (born 11 March 1991) is a Senegalese professional football player, with Italian citizenship, currently playing for Casalgrandese.
He made his Serie A debut for Livorno on 22 June 2021, in a game against Parma when he came on as a substitute in the 22nd minute for Fabio Galante. On 12 September he was transferred to Rosignano.