| Official Name: | Hjälstaby |
| Pushpin Map: | Sweden Uppsala#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type1: | Municipality |
| Subdivision Name1: | Uppsala Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Uppsala County |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Enköping[1] |
| Area Total Km2: | 2.87 |
| Population As Of: | 2005-12-31 |
| Population Total: | 120 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 59.6833°N 17.3833°W |
Hjälstaby is a village in Enköping Municipality, Uppsala County, Sweden.