is a town located in Hidaka Subprefecture, Hokkaidà Â, Japan. , the town had an estimated population of 19,785 in 1120 households, and a population density of 17 people per km<sup>2</sup>. The total area of the town is . Although Urakawa is the capital of Hidaka Subprefectre, Shinhidaka is the most populous town, and the economic center of the subprefecture.
Shinhidaka is located in southern Hokkaido, in the central coastal area of the Hidaka Subprefecture. The southwestern part faces the Pacific Ocean, and the mountainous area originating from the Hidaka Mountains in the northeastern part is designated as the Hidakasanmyaku-Erimo-Tokachi National Park. The southern part faces the Pacific Ocean. The urban area spreads out at the mouth of the Shizunai River. Its highest location is Mount Kamuiekuuchikaushi () at 1,979.4 m (6,494 ft). Takami Dam, Hokkaido's largest dam, is located in Shinhidaka.
Shinhidaka has a humid continental climate (Köppen Dfb) with warm summers and cold winters. With an alternate definition, using the âÂÂ3 ðC (27 ðF) isotherm, Shinhidaka falls in the rare oceanic climate (Cfb) of the east coast of the continents due to the warm current of Tsushima. Owing to its slightly more southerly latitude, easterly aspect and location on the sea, snowfall is much lighter than in the major cities of western Hokkaido like Sapporo, Hakodate, Asahikawa and Wakkanai. Precipitation in heaviest in the summer months when remnant typhoons may approach. Year-round sunshine, although less than in the Tokachi Plain, is also higher than western Hokkaido
Per Japanese census data, the population of Shinhidaka has declined in recent decades.
The river valleys of what is now Shinhidaka were occupied by the Ainu. From the 19th century, people from Japan began to settle in the region.
On March 31, 2006, the town of Mitsuishi merged with the town of Shizunai to create the new town of Shinhidaka.
Shinhidaka has a mayor-council form of government with a directly elected mayor and a unicameral town council of 16 members. Shinhidaka, as part of Hidaka Subprefecture, contributes two members to the Hokkaidà  Prefectural Assembly. In terms of national politics, the town is part of the Hokkaidà  9th district of the lower house of the Diet of Japan.
The main industries are dairy farming and fishing (kelp), as well as the breeding and production of racehorses, fishing, forestry, rice farming, field crops, and livestock farming.
Shinhidaka has four public elementary schools and three public middle schools operated by the town. The town has two public high schools and one special education school for the handicapped operated by the Hokkaido Board of Education. The town also has one vocational training school for nursing.
Shinhidaka was served by the JR Hokkaido Hidaka Main Line. However, no trains have operated between and since January 2015, due to storm damage. Plans to restore this section of the line have been abandoned, due to declining passenger numbers and very high maintenance costs, and the section was officially closed on 1 April 2021, and replaced by a bus service.
Defunct railway stations in Shinhidaka: - - - - - -
Shinhidaka's mascots are and . They are superhero siblings.