Clontarf Castle Hotel is the perfect choice for any conference or meeting. With a wide variety of function rooms available to suit meetings and events for 1 – 600 persons. All conference rooms are beautifully decorated and have been carefully designed to maximize natural daylight, they are fitted with the latest AV technology making Clontarf Castle the perfect conference venue.
Meeting Room
| Location | Length / Width (M) | Theatre | Classroom | U-Shape | Banquet Style | Boardroom |
| Great Hall | Ground Floor | 27.74 x 15.93 | 600 | 250 | 90 | 330 | - |
| Great Hall 1 | Ground Floor | 14.6 x 16.5 | 250 | 120 | 45 | 150 | 45 |
| Great Hall 2 | Ground Floor | 19.8 x 9.7
| 250 | 120 | 45 | 150 | 45 |
| Viking Suite | Lower Ground Floor | 19.8 x 9.7
| 150 | 65 | 45 | 140 | - |
| Viking Room 1 | Lower Ground Floor | 7.62 x 7.87
| 50 | 25 | 25 | 30 | 25 |
| Viking Room 2 | Lower Ground Floor | 6.77 x 10.52 | 50 | 25 | 28 | 30 | 28 |
| Viking Room 3 | Lower Ground Floor | 5.64 x 8.82 | 30 | 15 | 15 | 30 | 15 |
| Norman Suite | Lower Ground Floor | 7.34 x 7.87 | 50 | 25 | 25 | 30 | 25 |
| Dalcassian Suite | Lower Ground Floor | 9.45 x 6.45
| 50 | 25 | 25 | - | 25 |
| Tower Suite | Upstairs Tower - Original Castle
| 5.00 x 4.80 | 20 | 10 | 12 | 24 | 12 |