| Official Name: | Riidaku |
| Settlement Type: | Village |
| Subdivision Type: | Country |
| Subdivision Name: |  Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Rapla County |
| Subdivision Type2: | Parish |
| Subdivision Name2: | Märjamaa Parish |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Riidaku is a village in Märjamaa Parish, Rapla County in northwestern Estonia.[1] Between 1991–2017 (until the administrative reform of Estonian municipalities) the village was located in Raikküla Parish.