Tafunsak (formerly transliterated as Tahfuhnsahk) is the largest settlement on the island of Kosrae in the Federated States of Micronesia. Its population was 2,457 at the 2000 census. This includes Walung, which had been incorporated into the municipality of Tafunsak since the 1980s. The area of the municipality is 42.8 km², making it the largest municipality by area.