Among a variety of high-profile institutions, Niall O'Leary Services has provided consultancy, development and training for:
- Advance Systems Ireland
- Comhar
- Coventry University
- Department of Arts, Heritage and the Gaeltacht
- Dublin Business Innovation Centre
- Dublin City University
- Height for Hire
- Irish Manuscripts Commission
- Irish Research Council
- Irish Traditional Music Archive
- Inishowen Traditional Singers' Circle
- National University of Ireland, Galway
- Royal Irish Academy
- University College Dublin
- University of Bergen
- University of Cambridge