[1] The competition began on 17 August 2019, and concluded with the final at Windsor Park on 31 July 2020.

[3] Glentoran were the champions, taking their tally to 23 Irish Cup wins overall; their first for five years.

They defeated Ballymena United 2–1 after extra time in the delayed final to qualify for the 2020–21 UEFA Europa League preliminary round.

All ties level after 90 minutes used extra time to determine the winner, with a penalty shoot-out to follow if necessary.

The league tier of each club at the time of entering the competition is listed in parentheses.

The four quarter-final winners entered the semi-finals, which were originally scheduled to be played on 28 March 2020.

One of the first football matches in the United Kingdom to be played in front of fans since the beginning of the pandemic, the match ended with Glentoran defeating Ballymena United 2–1 after extra-time to win the Cup for the 23rd time, with goals coming from Paul O'Neill and Robbie McDaid.