• D.I.D Electrical
• DAC Beachcroft
• DB Schenker Ireland
• DFDS Group - Transport Provider
• DFS Ireland
• DPD (Dynamic Parcel Distribution) Group Ireland
• DV8 Fashion
• Dairygold
• Dalata Hotel Group
• Dangan Recruitment
• Dara Community Living
• Datalex plc
• Davy

• Dawn Farm Foods
• Delmec Engineering Ltd
• Deloitte
• Delphi Resort
• Dennehy Motors
• Dental Tech
• Depaul Ireland (Depaul International Group)
• Derrycourt Cleaning Specialists
• Design Build Search
• Deutsche Börse Group
• Diageo plc
• Diamond Coast Hotel
• Digital Arbitrage, Inc

• Direct Medics Healthcare Recruitment
• Direct Wholesale Kitchens
• Distilled SCH Shared Services
• Domino's Pizza
• Donnybrook Fair
• Dornan
• Down Syndrome Ireland
• Doyle Shipping Group
• Doyles Veg Prep
• Driving Force Ireland
• Dromoland Castle Hotel
• Dropbox, Inc.
• Druids Glen Hotel & Golf Resort

• Dublin City University
• Dublin Coach Quality Transport
• Dublin Dental University Hospital
• Dublin One Hotel
• Duffy Alexander Recruitment Ltd
• Dun & Bradstreet, Inc
• Dunboyne Castle
• Dundalk Institute Of Technology
• Dunnes Stores
• Dylan Hotel Dublin
• daa plc