Joshua Jon Cullen (born 7 April 1996) is a professional footballer who plays as a defensive midfielder for EFL Championship club Burnley.

He has previously played for West Ham United and Anderlecht and on loan for Bradford City, Bolton Wanderers and Charlton Athletic.

[7] Cullen was first included in a West Ham matchday squad for their Premier League fixture against Arsenal at the Emirates Stadium on 14 March 2015, remaining an unused substitute as they lost 3–0.

[11] With manager Slaven Bilić putting priority on the team's Premier League performance, he made an array of changes for their third qualifying round second leg away to Astra Giurgiu on 6 August, including starting Cullen in his first competitive match against a professional opponent.

[12] Twenty-three days later he made his Premier League debut, replacing Diafra Sakho at the end of a 3–0 win over Liverpool at Anfield.

[15] Before West Ham's EFL Cup fixture with Hull City on 23 September 2020, Cullen returned a positive test for COVID-19 along with manager David Moyes and teammate Issa Diop.

[25] On 5 October 2020, Cullen joined Belgian First Division A side Anderlecht on a permanent deal until 30 June 2023, after fifteen years at West Ham.

[26] He sent an emotional farewell message to West Ham fans on 12 October 2020 thanking them for their support and citing Mark Noble as one of his heroes.

[31] He scored his first goal for The Clarets on 30 March 2024 in 10-man Burnley's 2–2 draw at Stamford Bridge, also delivering the corner for Dara O'Shea's 81st-minute headed equaliser.