Tammiku is a village in Väike-Maarja Parish, Lääne-Viru County, in northeastern Estonia. 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 áÃÂÃÂÃÂÃÂ-âðüüøúà1900. The name (in the genitive case) comes from the common noun tammik 'oak forest', referring to the local vegetation.