• D.I.D Electrical
• DAC Beachcroft
• DCK Group
• DFDS Group - Transport Provider
• DFS Ireland
• DHL
• DPD (Dynamic Parcel Distribution) Group Ireland
• DPS
• Dabster systems
• Daffodil Care Services
• Dalata Hotel Group
• Danone Limited
• Datalex plc

• Daughters of Charity Service
• David Lloyd Leisure
• Davy
• Dawn Farm Foods
• Deliveroo
• Dell
• Delmec Engineering Ltd
• Deloitte
• Delphi Resort
• Dental Tech
• Dentsu Aegis Network
• Derrycourt Cleaning Specialists
• Design Build Search

• Designer Group
• Deutsche Bank
• Diageo plc
• Digital Arbitrage, Inc
• Ding
• Distilled SCH Shared Services
• Dixons Carphone plc
• DocuSign
• Dolmen Recruitment
• Domino's Pizza
• Donnybrook Fair
• Dornan
• Doyle Shipping Group

• Dromoland Castle Hotel
• Dropbox, Inc.
• Druids Glen Hotel & Golf Resort
• Dublin Business School - DBS
• Dublin City University
• Dublin Coach Quality Transport
• Dublin Dental University Hospital
• Dun & Bradstreet, Inc
• Dunboyne Castle
• Dundalk Institute Of Technology
• Dunnes Stores
• Dyson
• daa plc