| Official Name: | Viidu |
| Settlement Type: | Village |
| Subdivision Type: | Country |
| Subdivision Name: |  Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Saare County |
| Subdivision Type2: | Parish |
| Subdivision Name2: | Saaremaa Parish |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Viidu is a village in Saaremaa Parish, Saare County in western Estonia.
Before the administrative reform in 2017, the village was in Lääne-Saare Parish.
Tallinn Botanic Garden's Audaku experimental station is located in Viidu.
One part of Viidu is called as Audaku. Saaremaa most highest place (Rauna Hill) is located in Audaku.[1]