Humbang Hasundutan Regency is a regency in the southwest shore of Lake Toba of North Sumatra, Indonesia. The regency covers an area of 2,297.2 km2, and according to the 2010 census had a population of 171,687; the latest estimate (for January 2014) is 178,866. Its seat is Dolok Sanggul. To the north is Samosir Regency and Pakpak Bharat Regency, to the east is North Tapanuli Regency, and to the south is Central Tapanuli Regency and the Indian Ocean.
The regency is divided administratively into ten districts (kecamatan), tabulated below with their 2010 Census population:
Coordinates: 2°15′56″N 98°30′14″E / 2.2655°N 98.5038°E