• DB Schenker Ireland
• DV8 Fashion
• Dairygold
• Dairymaster
• Dangan Group
• Dangan Recruitment
• Dara Community Living
• David Walsh Civil Engineering Ltd.

• DeRisk Technologies
• Decotek Automotive
• Dennehy Motors
• Depaul Ireland (Depaul International Group)
• Deutsche Börse Group
• Devonshire Recruitment
• Diamond Coast Hotel
• Diamond Shine Cleaners

• Dillon Engineering Services
• Direct Medics Healthcare Recruitment
• Direct Wholesale Kitchens
• Dolmen Engineering
• Doolin Inn
• Down Syndrome Ireland
• Doyles Veg Prep
• Driving Force Ireland

• Drogheda Hire & Sales
• Dublin Bus
• Dublin City Council
• Dublin One Hotel
• Duffy Alexander Recruitment Ltd
• Dunwood Recruitment
• Dylan Hotel Dublin