The Britain's Got Talent star will play 11 dates throughout October this year.
The jaunt kicks off at Birmingham's O2 Academy on October 1 and wraps up in Leeds's The Wardrobe on October 26. He will also play a single date in London's Islington on October 22.
O'Shaughnessy will perform songs from his debut self-titled EP, which topped the Irish album chart and entered at number nine in the UK earlier this month.
The set includes lead single 'No Name', which also served as his audition song on Britain's Got Talent.
Tickets for the gigs, priced between £8 and £10, go on sale Friday, August 31 at 12pm.
The 19-year-old recently insisted that the EP showcases him as more than a singer-songwriter, adding: "Lyrically all the songs are quite personal, which really exposes me as a person."
The full tour dates appear below:
> Read Digital Spy's review of Ryan O'Shaughnessy's EP
- Monday 1st October – Birmingham, O2 Academy3
- Tuesday 2nd October – Sheffield, O2 Academy2
- Tuesday 9th October – Bristol, O2 Academy2
- Wednesday 10th October – Bournemouth, The Old Fire Station
- Thursday 11th October – Leicester, O2 Academy (The Scholar)
- Sunday 21st October – Liverpool, O2 Academy2
- Monday 22nd October – London, O2 Academy2 Islington
- Tuesday 23rd October – Guildford The Boileroom
- Wednesday 24th October – Hatfield, The Forum Hertfordshire (The Attic)
- Thursday 25th October – St Albans, The Horne
- Friday 26th October – Leeds, The Wardrobe
Watch Digital Spy's interview with Ryan O'Shaughnessy below: