Shimotsuke Province (下野国 Shimotsuke-no kuni?) was a province of Japan in the area of Japan that is today . Shimotsuke was bordered by Kōzuke, Hitachi, Mutsu and Shimōsa Provinces. Its abbreviated form name was Yashū (野州?). Under the Engishiki classification system, Shimotsuke was ranked as one of the 13 "great countries" (大国) in terms of importance, and one of the 30 "far countries" (遠国) in terms of distance from the capital. The provincial capital is located in what is now the city of . The Ichinomiya of the province is the Futarasan jinja located in what is now the city of .
During the 4th century AD, (Kofun period) the area of modern Gunma and southern Tochigi prefectures were known as Keno or Kenu (毛野?). At some unknown point in the 5th century, the area was divided at the Kinugawa River into Kamitsuteno (上毛野?) and Shimotsuteno (下毛野?). Per the Nara period Taihō Code, these provinces became Kamitsuteno-no-kuni (上毛野国?) and Shimotsuteno-no-kuni (下毛野国?). In 713, with the standardization of province names into two kanji, these names became Kōzuke (上野?) and Shimozuke (下野?).