| Type: | suburb |
| Calga | |
| City: | Central Coast |
| State: | nsw |
| Local Map: | yes |
| Zoom: | 12 |
| Postcode: | 2250 |
| Pop: | 134 |
| Elevation: | 176 |
| Parish: | Cowan |
| Stategov: | Gosford |
| Fedgov: | Robertson |
| Dist1: | 62 |
| Dir1: | N |
| Location1: | Sydney |
| Dist2: | 19 |
| Dir2: | W |
| Location2: | Gosford |
| Near-Nw: | Glenworth Valley |
| Near-N: | Somersby |
| Near-Ne: | Somersby |
| Near-W: | Glenworth Valley |
| Near-E: | Mooney Mooney Creek |
| Near-Sw: | Mount White |
| Near-S: | Mooney Mooney Creek |
| Near-Se: | Mooney Mooney Creek |
Calga is a suburb and locality of the Central Coast region of New South Wales, Australia, located 62km (39miles) north of Sydney. It is part of the local government area.
It is home to a major interchange on the Pacific Motorway, Old Pacific Highway, and the Australia Walkabout Wildlife Park.
Calga lies within the traditional lands of both the native Darkinjung and Kuringgai peoples and is an Aboriginal word meaning "the mouth". The locality's main feature is the state heritage-registered Aboriginal women's site, whose highlight includes the site of a sandstone amphitheatre.
In the 2021 Census, there were 134 people in Calga. 79.1% of people were born in Australia and 88.1% of people spoke only English at home.
Calga has a number of heritage-listed sites, including: