| Pak Chau | |
| Native Name: | 白洲 |
| Native Name Link: | Cantonese language |
| Map: | Hong Kong |
| Coordinates: | 22.3502°N 113.8667°W |
| Country Admin Divisions 2: | People's Republic of China |
| Country Admin Divisions Title 2: | Sovereign state |
| Country Admin Divisions Title: | District |
| Country Admin Divisions: | Tuen Mun |
| Country Admin Divisions 1: | New Territories |
| Country Admin Divisions Title 1: | Statutorily-defined area |
Pak Chau or Tree Island[1] is an island at the northwest water of Hong Kong. It is offshore of Lung Kwu Tan near Tuen Mun in the New Territories.
Since 1996, the island, Lung Kwu Chau, and Sha Chau are within the boundaries of the Sha Chau and Lung Kwu Chau Marine Park. The three islands have been listed as a Site of Special Scientific Interest since 1979.[2] It is known as a dolphin sanctuary and a habitat for the Chinese white dolphin.