Grennan College has established a board to manage the school on behalf of and in cooperation with Kilkenny & Carlow ETB (Education & Training Board) and for the benefit of the students and their parents and to provide an appropriate education for each student at the school. The board consists of ETB Committee Members, Parent Representatives and Staff Representatives as follows:
Members 2015-2016
| Mr. D. Dooley | Chairperson (Teacher Representative) |
| Cllr. Pat Cleere | ETB Nominee |
| Ms Eleanor Reddy | ETB Nominee |
| Ms Nicola Murphy | Teacher Representative |
| Mr. Kevin Kelly | Parent Representative |
| Mrs Bernie Wemyss | Parent Representative |
| Mr. Sean Og O’ Sullivan | (Secretary) Principal |