| Official Name: | Mustu |
| Settlement Type: | Village |
| Subdivision Type: | Country |
| Subdivision Name: |  Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Harju County |
| Subdivision Type2: | Parish |
| Subdivision Name2: | Saue Parish |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Mustu is a village in Saue Parish, Harju County in northern Estonia.[1] Prior to the administrative reform of Estonian local governments in 2017, the village belonged to Nissi Parish.