[3] The club was founded at the amateur level as Sankospor under Sanko Holding A.Ş., an industrial group of companies headquartered in Gaziantep, in 1988.

[7] The club won the Group C title of the 2004–05 season of the TFF Second League,[4] winning 22 games out of 34 with 73 points, scoring 90 goals.

[13] In 2018–19 season, this time club defeated Hatayspor by 5–3 final score after penalty shoot-outs and promoted to Süper Lig.

[15] Following their promotion to Süper Lig, the club announced the employment of Marius Șumudică as head coach on a single-season-basis contract with a potential one season extension, on 13 June 2019.

[17] In match week 1 of 2019–20 season, the club made their Süper Lig debut against Fenerbahçe on an away game held at Şükrü Saracoğlu Stadium, which Gaziantep FK lost by 0–5 final score, on 19 August 2019.

[22] On week 17 of the 2020–21 season, beating Ankaragücü by 2–0 final score, reaching 31 points, Gaziantep FK topped the first position of Süper Lig standings, with one game in front Beşiktaş, on 5 January 2021.

[3][23] Following a 1–3 loss against Galatasaray at week one, the 2019–20 season, the team retained a 15-week-long unbeaten record until 9 January 2021, where they have been eventually beaten by Sivasspor by 1–2.

[28][29] The club agreed with Portuguese former international Ricardo Sá Pinto on a two-and-a-half-season-long contract, with a potential one season extension, on 20 January 2021.

[4] The colors were altered into "white-red-black" combination and the new and current logo was enacted, all together under the scope of a council board, including changing the name of club, held in June 2017.

[46] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.