The FAI Cup 2009 was the 89th season of the national football competition of the Republic of Ireland.
The winner - Sporting Fingal - earned spots in both the second qualifying round of the 2010–11 UEFA Europa League and the 2010 Setanta Sports Cup.
The first round matches were played on the weekend ending 26 April 2009.
The matches were played the weekend ending 16 August 2009.
The semi-final draw took place on Monday, 21 September.