| Official Name: | Tammiku |
| Settlement Type: | Village |
| Subdivision Type: | Country |
| Subdivision Name: |  Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Lääne-Viru County |
| Subdivision Type2: | Parish |
| Subdivision Name2: | Väike-Maarja Parish |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Tammiku is a village in Väike-Maarja Parish, Lääne-Viru County, in northeastern Estonia.[1] Prior to the 2017 administrative reform of Estonian local governments, the village was part of Rakke Parish.
The village was originally called Suure-Tammiku (literally, 'big Tammiku') in contrast to neighboring Väike-Tammiku (literally, 'little Tammiku'). It was attested in written records as Tamicas in 1241 (referring to the village), as Gross-Tamkas in 1526 (referring to the manor), and as Сууръ-Таммикъ 1900. The name (in the genitive case) comes from the common noun tammik 'oak forest', referring to the local vegetation.[2]