Abdoulay Diaby (born 21 May 1991) is a French-born Malian professional footballer who plays for Portuguese club Sporting CP as a striker.
Born in Nanterre, France, Diaby began his career at Sedan, having been passed by INF Clairefontaine (French national Football Centre). After progressing through the ranks of Sedan, Diaby made his professional debut on 4 May 2010 against Dijon, where he came on as a substitute for Lossémy Karaboué in the 73rd minutes, in a 3–1 loss. He made another appearances for the side three days later on 7 May 2010, again coming on as a substitute, in a 0–0 draw against AC Arles-Avignon. He went on to make two appearances in the 2009–10 season.
In the 2010–11 season, Diaby made his first team appearance on 20 November 2010, where he started the match, in a 2–0 win over FC Steinseltz in the seventh round of Coupe de France. On 13 January 2011, Diaby signed his first professional contract with the club, keeping him until 2014. He scored his first goal for the club and set up one of the goals, in a 5–3 loss against FC Istres on 11 March 2011. Seven days later, on 18 March 2011, he scored in a follow–up match, in a 1–1 draw against Le Havre. At the end of the 2010–11 season, he went on to make eleven appearances and scoring two times in all competitions.