| Type | Voluntary aided school |
| Phase | Primary |
| Gender | Mixed |
| Age Range | 4 - 11 |
| Headteacher | Mrs Emma Phillips |
| Address |
15 London Road Welwyn AL6 9DJ |
| Religious Character | Church of England |
| Website | http://www.welwynst-marys.herts.sch.uk/ |
| Telephone | 1438714169 |
| Number of pupils | 419 |
| Inspection | Outstanding |
| Primary school national ranking | Top 24% |
| Local authority | Hertfordshire |
| Region | East of England |
| URN | 117490 |
| View this school information in GOV.UK website | |