Tamatam or Tamatan is an island, village and municipality in the state of Chuuk, Federated States of Micronesia.

Tamatam or Thamatam is also referred to one family name or Surname in Reddy community / Caste, Predominantly lives in the state of Andhra Pradesh, India. But this Tamatam Surname does not relate in any way to island Tamatam. The Surname or family name Tamatam inherited to some families living in the State of Andhra Pradesh is derived from a musicale instrument called as Tamatamu, being used in village functions in ancient times . Now this musical instrument is almost extinguished and not in use.