| Country: | England |
| Shire District: | East Hertfordshire |
| Shire County: | Hertfordshire |
| Region: | East of England |
| Coordinates: | 51.782°N -0.137°W |
| Civil Parish: | Hertingfordbury |
| Postcode District: | SG14 |
| Postcode Area: | SG |
| Post Town: | Hertford |
| Constituency Westminster: | North East Hertfordshire |
Letty Green is a village in the parish of Hertingfordbury, Hertfordshire, England.
St John’s Church, Letty Green, the deconsecrated former parish church, is a grade II listed building, and Woolmer's Park country house is grade II* listed and was the source for the name of Woolmers Estate in Tasmania.