Teshikaga (弟子屈町 Teshikaga-chō) is a town located in Kawakami District, Kushiro Subprefecture, Hokkaidō Prefecture. As of December 31, 2007 it has an estimated population of 8,690 and an area of 774.53 km².
Famous tourist attractions in the town include Lake Mashu (Ainu: Kamuy-to), Lake Kussharo (Ainu: Kuccharo) and Kawayu Onsen. The climate is so cold that diamond dust can be seen in winter.