Ireland first competed at IOL 2009, when the competition was held in Wrocław, Poland.
Representing Ireland were:
- Kieran Fleming, St Caimin’s Community School, Shannon, Co Clare
- Ruadhan Treacy, Newtown School, Waterford
- Stephen Ennis, Newtown School, Waterford
- Aislinn McGuire, Mount Temple School, Dublin
Ruadhan Treacy received an Honourable Mention for Ireland at the 2009 IOL.