| Official Name: | Orjaku |
| Settlement Type: | Village |
| Pushpin Map: | Estonia |
| Subdivision Type: | Country |
| Subdivision Name: |  Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Hiiu County |
| Subdivision Type2: | Parish |
| Subdivision Name2: | Hiiumaa Parish |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
| Coordinates: | 58.8°N 69°W |
Orjaku is a village in Hiiumaa Parish, Hiiu County in northwestern Estonia.[1]
Orjaku is one of the oldest names in the island of Hiiumaa. It was first mentioned 1254 as Oryocko, Oriwocko.
As of 2019, there are 101 people living in the village.