| Woollahra Reservoir | |
|---|---|
 Woollahra Reservoir | |
| Location | 5R Oxford Street, Centennial Park, New South Wales, Australia |
| Coordinates | 33°53′25″S 151°14′28″E / 33.8904°S 151.2411°E |
| Built | 1880 |
| Architect | NSW Public Works Department |
| Owner | Sydney Water |
| Official name | Woollahra Reservoir WS022 |
| Type | State heritage (built) |
| Designated | 18 November 1999 |
| Reference no. | 1356 |
| Type | Water Supply Reservoir/ Dam |
| Category | Utilities - Water |
| Builders | NSW Public Works Department |
  Location of Woollahra Reservoir in Sydney | |
The Woollahra Reservoir or WS022 is a heritage-listed underground reservoir at 5R Oxford Street, Centennial Park, New South Wales, Australia. It was designed and built by the NSW Public Works Department. The property is owned by Sydney Water. A sign attached to a building on the site states that this is known as "Centennial Park number 1 Water Reservoir Underground WS0022". The reservoir is adjacent to Centennial Park Reservoir. This reservoir is closer to York Street than Centennial Park Reservoir. The area is enclosed by a high fence and a sign on the main gate states: WARNING KEEP OUT" and that trespassers may be prosecuted.