| Official Name: | Billdal |
| Pushpin Map: | Sweden Halland#Sweden Västra Götaland#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Kungsbacka Municipality and Gothenburg Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Halland County and Västra Götaland County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Halland |
| Area Footnotes: | [1] |
| Area Total Km2: | 10.14 |
| Population As Of: | 31 December 2010 |
| Population Total: | 10,289 |
| Population Density Km2: | 1015 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 57.5833°N 67°W |
Billdal is a bimunicipal locality situated in Kungsbacka Municipality, Halland County, and Gothenburg Municipality, Västra Götaland County, in Sweden. It had 10,289 inhabitants in 2010. It mainly consists of villas and terraced houses, grouped along a windling coastline with many islands.