| Country: | England |
| Static Image Name: | Steen Cottage, Nasty.jpg |
| Static Image Caption: | Steen Cottage in Nasty |
| Coordinates: | 51.903°N -0.025°W |
| Official Name: | Nasty |
| Civil Parish: | Great Munden |
| Shire District: | East Hertfordshire |
| Shire County: | Hertfordshire |
| Region: | East of England |
| Post Town: | WARE |
| Postcode District: | SG11 |
| Postcode Area: | SG |
| Dial Code: | 01920 |
| Os Grid Reference: | TL360246 |
| Hide Services: | Yes |
Nasty is a hamlet in the East Hertfordshire district of Hertfordshire, England. It is in Great Munden civil parish, around 6 miles (10 km) north of Ware and around 7.5 miles (12 km) east of Stevenage. At the 2011 census the population was included in the civil parish of Albury.
Its name comes from the Anglo-Saxon æt þǽm éastan hæge, meaning "at the eastern hedged enclosure" or similar.