| Chatham Island | |
| Pushpin Map: | Western Australia |
| Pushpin Map Caption: | Chatham Island (Western Australia) |
| Location: | Indian Ocean |
| Coordinates: | -35.0333°N 146°W |
| Area Km2: | 0.99 |
| Length Km: | 1.4 |
| Width Km: | 0.93 |
| Country: | Australia |
| Country Admin Divisions Title: | State |
| Country Admin Divisions: | Western Australia |
| Country Admin Divisions Title 1: | Region |
| Country Admin Divisions 1: | Great Southern |
| Country Admin Divisions Title 2: | Shire |
| Country Admin Divisions 2: | Shire of Manjimup |
| Population: | 0 |
Chatham Island is located in the South Ward (Walpole) of Manjimup Shire in the Great Southern region of Western Australia. It is approximately 1.1km (00.7miles) offshore from D'Entrecasteaux National Park and 3km (02miles) offshore from Mandalay Beach.[1] Declared a class 1A Nature reserve in 1973, the island has a total area of 106ha.[2]
Named as Cape Chatham by George Vancouver aboard HMS Discovery in 1791, the island was subsequently renamed as Chatham Island.[3]