| Country: | England |
| Official Name: | Round Island |
| Static Image Name: | Round Island - geograph.org.uk - 1772292.jpg |
| Static Image Caption: | Round Island viewed from the western shore of Poole Harbour |
| Label Position: | bottom |
| Coordinates: | 50.6861°N -2.0163°W |
| Map Type: | Dorset |
| Civil Parish: | Corfe Castle |
| Shire District: | Purbeck |
| Shire County: | Dorset |
| Region: | South West England |
| Constituency Westminster: | South Dorset |
| Os Grid Reference: | SY988874 |
Round Island is an island in Poole Harbour in the English county of Dorset. It lies just off the shore of the Arne Peninsula in the south-west of the harbour, and is separated from the nearby uninhabited Long Island by a narrow channel only a few feet wide.[1] [2]
The island is 15 acres in size, being a private property with a mix of grassy paddocks and woodland.
Round Island lies within the civil parish of Corfe Castle. The parish was formerly part of the Purbeck local government district,[1] but now forms part of Dorset Council.