Listed below are Contracting Authorities that use the system. The list of such Contracting Authorities maintained on may be updated from time to time.

Ministers of the Government of Ireland; Central Government Departments; offices and non-commercial agencies and organisations which have a formal reporting and legal relationship to Central Government Departments, including all local authorities in Ireland (as defined in the Local Government Act 2014), (themselves including regional assemblies, local enterprise boards and library bodies), and those approved housing bodies which also constitute “bodies governed by public law” within the meaning of Regulation 2 of the European Union (Award of Public Authority Contracts Regulations 2016 (S. I. No. 284 of 2016), listed on the Register of Approved Housing Bodies maintained by the Department of Housing, Planning, Community and Local Environment currently approved under section 6 of the Housing Act 1992

Contracting authorities in the Irish health sector including but not limited to the Health Service Executive (HSE); the Health Information and Quality Authority (HIQA) and HSE funded Agencies delivering health & personal social services funded by more than 50% from Exchequer funds

Contracting authorities which are Third Level Educational Institutions (including universities, institutes of technology and members of the Education Procurement Service)

Contracting authorities which are Education and Training Boards (ETBs) and ETB schools, and primary, post-primary, special and secondary schools as well as ETBs acting on behalf of schools

An Garda Síochana (Police)

The Irish Prison Service

The Defence Forces.