| Official Name: | Aru |
| Settlement Type: | Village |
| Subdivision Type: | Country |
| Subdivision Name: |  Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Harju County |
| Subdivision Type2: | Parish |
| Subdivision Name2: | Kuusalu Parish |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Aru is a village in Kuusalu Parish, Harju County in northern Estonia.[1]
Aru was attested in written sources as Arroperre in 1690, Arro in 1844 (referring to the farm), and Арокюля in 1866 (referring to the village). The village is named after its oldest farm, called Arupere: the second part, pere, means 'family, household', and aru means 'dry meadow/grassland; higher, drier land'. The reference work Baltisches historisches Ortslexicon (vol. 1, 1985) cites Arweculle (in 1290) and Arrenküll (in 1291) as the earliest attestations of the name, but these are not certain.[2]