Teluk Dalam is a town and district located in the South Nias Regency of the North Sumatra province in Indonesia. The name translates to "Deep Bay" in English. Following the division of parts of the original district to establish new administrative areas, the current district is primarily confined to the town area, which covers approximately 110.11 km2 (42.51 sq mi).
As of mid-2023, Teluk Dalam had a population of 26,456 with a population density of 240 per km2. The area is known for various tourist sites, including Sorake Beach and Lagundri Beach. It also features Bawömataluo, a site that hosts traditional Nias houses dating back hundreds of years.