"While winning the Irish Open meant a lot to me, being able to give my prize money to three local children's charities made it all feel much more special," the world number five said in a news release on Tuesday.
"I can think of no charities as worthy or deserving of support than Barretstown, the Jack and Jill Foundation and LauraLynn Children's Hospice."
Four-times major winner McIlroy shot a closing 69 to finish three shots clear of Scotland's Russell Knox and Welshman Bradley Dredge at the K Club on the outskirts of Dublin in May.
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"This 317,000 euros donation (for each charity) from the Rory Foundation is literally a gift of time to the families under our wing," said Jack and Jill Foundation chief executive Jonathan Irwin.
(Writing by Tony Jimenez; Editing by Ken Ferris)
