It's on the same week his album 'Wasteland Baby' reached the top of the Billboard 200 charts in the US.
More than 57,000 tickets for the country's biggest music festival sold out in record time last December.
The Strokes, Florence & The Machine, and The 1975 will headline this year's Electric Picnic.
Christine and the Queens, Dermot Kennedy and Billie Eilish will also perform at the festival in Laois this September.
He is currently travelling across America as part of his Wasteland Baby tour and recently made a suprise appearence at a New York Subway station.
Dropped in on some New Yorkers’ commute home tonight for a quick subway session. #wastelandbaby 🎧 hozier.lnkk.to/wastelandbabyPosted by Hozier on Wednesday, March 6, 2019
He also made an appearence on The Late Show With Stephen Colbert on CBS