• D.I.D Electrical
• 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
• Dogpatch Labs
• 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
• Dun Laoghaire Institute of Art, Design & Technology - IADT
• Dunboyne Castle
• Dundalk Institute Of Technology
• Dunnes Stores
• daa plc