| Round Island | |
| Native Name: | 銀洲 |
| Nickname: | --> |
| Pushpin Map: | Hong Kong Island |
| Coordinates: | 22.2159°N 114.1858°W |
| Location: | Southern District |
| Area Km2: | 0.17 |
| Length M: | --> |
| Width M: | --> |
| Coastline M: | --> |
| Country Admin Divisions Title: | Districts |
| Country Admin Divisions: | Southern District |
| Country Area M2: | or |
| Country Area Ha: | --> |
| Country1 Area M2: | or |
| Country1 Area Ha: | --> |
Round Island or Ngan Chau is an island in Hong Kong. Administratively part of the Southern District, the island has an area of km2. An unmanned navigational beacon was constructed on the island in 1972.
Round Island has a hilly terrain. The island's highest point is 49 metres over the sea. It stretches 0.6 km in north–south direction, and 0.5 km in east–west direction.
The climate in the area is temperate. The yearly mean temperature in the region is 21 °C. The warmest month is August, when the mean temperature is 24 °C, and the coldest is February at 16 °C. The average yearly precipitation is 2150 mm. The rainiest month is May, with in average 538 mm precipitation, and the driest month is October, with 18 mm precipitation.