This is a list of bands from Ireland (Republic of Ireland and Northern Ireland).
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- O Emperor
- Oppenheimer
- O.R.B. – (Formerly The Original Rude Boys)
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- The Sands Family
- The Saw Doctors
- Scheer
- The Script
- Scuba Dice
- Scullion
- Seo Linn
- Sephira
- September Girls
- Shouting at Planes
- Shrug
- Silent Running
- Size2shoes
- Skara Brae
- Skid Row
- Skruff
- Snow Patrol
- Something Happens
- Sprints
- Stand
- Stanley Super 800
- The Stars of Heaven
- Stiff Little Fingers
- St. Laurence O'Toole Pipe Band
- Stockton's Wing
- The Strypes
- The Stunning
- The Sultans of Ping FC
- Stump
- Sweeney's Men
- Sweet Savage