Okay Yokuslu (born 9 March 1994) is a Turkish professional footballer who plays as a defensive midfielder for EFL Championship club West Bromwich Albion and the Turkey national team.

On 27 June 2011, at the age of 17, he signed for Kayserispor for a record transfer fee for Altay of TRY 2.3 million (€1 million). He made his Super Lig debut in the starting line-up in which Kayserispor were beaten by Antalyaspor with 1–0 final score, on 16 September 2011.

On 1 February 2021, Yokuslu joined English club West Bromwich Albion on loan from RC Celta de Vigo, for the remainder of the 2020–21 season. Six days later, he made his debut for Albion as a substitute for Romaine Sawyers in a 0–2 away league defeat by Tottenham Hotspur.

On 26 January 2022, Yokuslu moved to fellow La Liga side Getafe CF on loan until June.

On 18 July 2022, Yokuslu returned to now EFL Championship club West Bromwich Albion on a three-year contract following his departure from Celta Vigo. He scored his first goal for the club on 1 November 2022 in a 1-0 home win against Blackpool. On 5 May 2023, Yokuslu won West Brom's 2022/23 players' player of the Year award in his first full season with the club.

Okay was selected for Turkey's U-20 squad for the 2013 FIFA U-20 World Cup. He scored "a beautifully judged chip over the stranded [goalkeeper] from 25 yards (23 m)" to complete the hosts' 2–1 defeat of Australia and progression to the last 16 of the competition. On 6 November 2015, Yokuslu was selected for the Turkey national football team to play friendlies against Qatar and Greece respectively. He made his debut as a late sub against Greece in a 0–0 tie.