| O Happy Day Daycare |
| O'Connor Child Care Centre |
| O'Connor School Age Satellite |
| Oakwood Children's House |
| Odyssey Montessori School |
| Ogden Day Care Centre |
| One Step At A Time Child Care |
| Orchard Grove Child Care |
| Orde Day Care Centre |
| Orde Day Care Satellite |
| Oriole Nursery School |
| Our Happiness Day Nursery |
| Our Lady Of Grace Jr YMCA |
| Our Lady Of Peace School Age YMCA |
| Our Lady Of Sorrows School Age YMCA |
| Owen Community Learning Centre |
| Oxford Learning Centre - 1217984 Ontario |
| Oxford Little Readers Program |