The 2021–22 Northern Ireland Football League Cup (known as the BetMcLean League Cup for sponsorship purposes) was the 35th edition of Northern Ireland's football knock-out cup competition for national league clubs, and the seventh edition of the competition as the Northern Ireland Football League Cup. The competition was contested by the 35 member clubs of the Northern Ireland Football League, commencing on 31 July 2021 with the first round and concluding with the final on 13 March 2022. The competition was sponsored by McLean Bookmakers, the title sponsors of the cup since the 2017–18 season.