Abdoulaye Sadio Diallo (born 28 December 1990) commonly known as Sadio Diallo, is a Guinean professional footballer who plays as a midfielder.

Diallo started his career for the Corsican club SC Bastia in the 2009–10 Ligue 2 season.

In 2010, he made his debut for the Guinea national team.

On 5 June 2011, Diallo scored the third goal in Guinea's 4–1 win over Madagascar which saw them move clear at the top of Group B of the Africa Cup of Nations qualifiers as Nigeria drew 2–2 in Ethiopia.