Abdoulay Diaby (born 21 May 1991) is a professional footballer who most recently played as a left winger for Pendikspor.

[2] 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 minute, in a 3–1 loss.

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.

[15] After serving a match suspension, Diaby returned to the starting line-up and scored in a 3–1 loss against Stade Lavallois on 14 September 2012.

[18] Despite suffering from injury and suspension towards the end of the 2012–13 season,[19] Diaby went on to make 28 appearances and scoring seven times in all competitions.

[20][21] After his two years spell at Royal Mouscron-Péruwelz came to an end in the 2014–15 season,[22] Diaby signed a two–year contract with Lille, keeping him until 2019.

[23] He made his Lille debut on 28 February 2015, where he came on as a late substitute for Divock Origi, in a 2–1 win against Lyon.

[20][26] Diaby made his Royal Mouscron-Péruwelz debut, where he came on as a substitute for Antonio Jakoliš in the 74th minute, in a 2–1 win over RWS Bruxelles on 10 August 2013.

[32] In his second season, with Royal Mouscron-Péruwelz in the Jupiler Pro League, he started well scoring against Waasland-Beveren, Standard Liège (twice), Zulte Waregem and Cercle Brugge (twice).

[38] Diaby made his Club Brugge debut on 16 July 2015, where he started the whole game, in a 1–0 against Gent in the Belgian Super Cup.

[40] In a follow up match against KV Mechelen on 1 August 2015, Diaby scored his first goal for the club, in a 3–0 win.

[46] After serving a one-match suspension, he returned to the starting lineup on 9 April 2016 against Gent, which saw Club Brugge win 2–0.

[57] Throughout December, Diaby produced a goal scoring form against Lokeren, Anderlecht (twice), KV Mechelen and Royal Mouscron-Péruwelz (twice).

It was announced on 21 August 2018 that Diaby joined Portuguese club Sporting CP, signing a five–year contract on an undisclosed fee, though it was reported to cost €4 million.

"[67] He made his league debut for the club on 24 September 2018, coming on as an 86th-minute substitute for Nemanja Gudelj in a 1–0 away defeat to Braga.

[69] On 17 January 2021, Diaby was recalled by Sporting CP from Getafe after three appearances and subsequently loaned to Belgian club RSC Anderlecht until the end of the season.

On 18 January 2021, Diaby joined Belgian First Division A club Anderlecht on loan until the end of the season.

[75] In the Africa Cup of Nations qualification, Diaby then scored two goals in two matches between 4 June 2016 and 4 September 2016 against South Sudan and Benin.