The 2018–19 Irish Cup (known as the Tennent's Irish Cup for sponsorship purposes) was the 139th edition of the premier knock-out cup competition in Northern Irish football. The competition began on 11 August 2018 and concluded with the final at Windsor Park on 4 May 2019. Coleraine were the defending champions, having defeated Cliftonville in the 2018 final. Crusaders were the eventual winners, defeating second-tier side Ballinamallard United 3–0 in the final to lift the Cup for the fourth time overall, and the first time in the 10 years since winning the 2009 final.