Ackley Bridge is a British comedy-drama series set in a multicultural academy school of the same name. The series is filmed in Halifax, West Yorkshire and it began broadcasting on Channel 4 on 7 June 2017. In the fourth series, Ackley Bridge saw a major overhaul, including different time slots, a shortened runtime, several new characters to replace cast exits and moving the series onto streaming platform All 4.

The fourth series of the British television drama series Ackley Bridge began broadcasting on Channel 4 on 19 April 2021. The series follows the lives of the staff and pupils at the fictional multi-cultural academy school Ackley Bridge College, in the fictitious Yorkshire mill town of Ackley Bridge. When the commissioning of the series was announced, it was announced that Ackley Bridge would face an overhaul, including cast changes, a shortened runtime and a revised timeslot. The series consists of ten thirty-minute episodes, whereas episodes in the previous three series were double the duration. Unlike the first three series, the timeslot was moved to 6pm to appeal to a younger audience. Following the premiere of the first episode on 19 April, the series was made available to stream as a boxset on All 4.