| Official Name: | Hagby |
| Pushpin Map: | Sweden Kalmar#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Kalmar Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Kalmar County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Småland |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.94 |
| Population As Of: | 31 December 2010 |
| Population Total: | 689 |
| Population Density Km2: | 355 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 56.5603°N 16.1819°W |
Hagby is a locality situated in Kalmar Municipality, Kalmar County, Sweden with 689 inhabitants in 2010. Hagby Church that lies in Hagby is one of only eight medieval round churches in Sweden.