| Multidisciplinary Technologies | 3696 |
| Chemical and Pharmaceutical Sciences | 4876 |
| Dublin Institute of Technology | 4673 |
| Campus Planning Office | 8057 |
| Research & Enterprise | 2205105 |
| Research and Enterprise | 7511 |
| Architecture & Urban Design | 3948 |
| Accounting and Finance | 3097 |
| College of Engineering & Built Environment | 3650 |
| Hospitality Management and Tourism | 4398 |
O'Brien, Tony | Construction Skills | 3897 |
| Research and Enterprise | 3442 |
| Retail and Services Management | 7062 |
| Mechanical and Transport Engineering | 2967 |
| Culinary Arts and Food Technology | 4477 |
O'Callaghan, Orla | Architecture & Urban Design | 8784024 |
| Real Estate and Construction Economics | 3865 |
| Electrical and Electronic Engineering | 2807 |
| Hothouse Knowledge Transfer Office City Campus | 3111 |
| Accounting and Finance | 3232 |
| Campus Services & Relocation | 3354 |
| Campus Services & Relocation | 2205099 |
O'Connor, Anthony | Mechanical and Transport Engineering | 3809 |
| School of Creative Arts | 4246 |
| Food Science & Env. Health | 4455 |
| Hospitality Management and Tourism | 7585 |
O'Connor, David | Chemical and Pharmaceutical Sciences | 4571 |
| Environmental Planning and Management | 3803 |
| Food Science & Env. Health | 7550 |
| Financial Aid & Accommodation Services | 2205017 |
O'Connor, James | Construction Management & Technology | 3886 |
| Culinary Arts and Food Technology | 4435 |
| Disability Support Service | 7656 |
| Disability Support Service | 2205097 |
| Dublin Institute of Technology | 3962 |
O'Connor, Tony | Sports | 0876114055 |
| Chemical and Pharmaceutical Sciences | 2861 |
| Civil and Structural Engineering | 2913 |
| Retail and Services Management | 7012 |
| Technological University Programme Team | 0868211031 |
O'Donoghue, Donnacha | Hospitality Management and Tourism | 7547 |
| Chemical and Pharmaceutical Sciences | 4775 |
| Chemical and Pharmaceutical Sciences | 4766 |
| Civil and Structural Engineering | 3711 |
| Electrical and Electronic Engineering | 4796 |
| Electrical and Electronic Engineering | 4875 |
| Dublin Institute of Technology | |
| Electrical and Electronic Engineering | 4772 |
O'Flaherty, Micheal | Civil & Building Services Engineering | 3830 |
| Electrical and Electronic Engineering | 4962 |
O'Hanlon, Tracy | Maintenance | 3607 |
| Hospitality Management and Tourism | 4234 |
| Civil and Structural Engineering | 3907 |
| Learning Teaching & Technology Centre | 7872 |
| Technological University for Dublin | 4236 |
| Dublin Institute of Technology | 4718 |
| Hospitality Management and Tourism | 4465 |
| Accounting and Finance | 7192 |
O'Leary, Vincent | Print and Digital Media | 3772 |
| Accounting and Finance | 3231 |
O'Meara, Finbarr | Electrical and Electronic Engineering | 4722 |
| Disability Support Service | 0861744955 |
| Retail and Services Management | 7003 |
| Mechanical and Transport Engineering | 3789 |
O'Neill, Mandy | Photography | 6752618 |
| Languages Law and Social Sciences | 4466 |
O'Neill, Maurice | Physics | 4813 |
| Quality Assurance | 2205078 |
| Civil & Building Services Engineering | 3909 |
| Hospitality Management and Tourism | 4469 |
| Accounting and Finance | 7175 |
| Hothouse Knowledge Office City Campus | 5330 |
| Languages Law and Social Sciences | 7580 |
| Retail and Services Management | 7044 |
| Real Estate and Construction Economics | 3739 |
| International Office | 4253 |
| Accounting and Finance | 3226 |
| Electrical and Electronic Engineering | 2801 |
O'Rourke, Brendan | Dublin Institute of Technology | 7097 |
O'Rourke, Fergal | Engineering | 2978 |
| Digital Campus & Learning Transformation | 7860 |
| Mechanical and Design Engineering | 3847 |
| Languages Law and Social Sciences | 4644 |
O'Shea, Anthony | Focas | 7973 |
O'Shea, Denis | Tourism & Food | 4508 |
O'Shea, Kevin Cornelius | Art Design and Printing | 8550466 |
| Chemical and Pharmaceutical Sciences | 4956 |
| Hospitality Management and Tourism | 7592 |
| Mathematical Sciences | 4823 |
O'Sullivan, Vincent | Maintenance | 3607 |
| Transport Engineering Environment & Planning | 3745 |
| Languages Law and Social Sciences | 4522 |
| Mechanical and Design Engineering | 2915 |
| Languages Law and Social Sciences | 4552 |
Olwill, Ronan | Construction | 4756911 |
Onyejelem, Chinedu Nnadozie | Media | 4508 |
Operator, Switch | Telephone Services | 3000 |
| Civil & Structural Engineering | 3840 |
Overnight Experiments Rooms | | 7999286 |
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