The Scottish singer-songwriter will play in Dublin's Marlay Park on June 24th, 2026, then Thomond Park in Limerick on June 26th, followed by a show at Belfast Vital on August 20th.
Pre-sale tickets will be available from Thursday at 9am with general sale kicking off on Friday from 9am.
Tickets range in price from €81.10 to €91.10 and are available via Ticketmaster.
The announcement comes during Lewis's current sold-out 17-date UK arena tour, his first return to touring in two years.
Lewis' last release, the record 'Broken By Desire To Be Heavenly Sent', scored him his second UK number 1 album.
It created three UK number 1 singles with 'Pointless', 'Wish You The Best', and 'Forget Me'.