Tammiku (; ) is a small borough in Jõhvi Parish, Ida-Viru County, in northeastern Estonia. It is located about southwest of the town of Jõhvi and about northwest of Kohtla-Järve's Ahtme district. As of the 2011 census, the settlement's population was 291.

Name Tammiku was first mentioned as Damicas in 1241 in the Danish Census Book, and later as Tammykass in 1533 and Tammiku-Mõisaküla in 1945. The name (in the genitive case) comes from the common noun tammik 'oak forest', referring to the local vegetation.

Notable people Tammiku is the birthplace of Estonian amateur featherweight boxer Evald Seepere (1911–1990).

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