National Route 12 (国道12号, Kokudō Jūni-gō) is a Japanese national highway connecting the two largest cities of Hokkaido, Sapporo and Asahikawa. The 135.7-kilometer-long (84.3 mi) highway begins at an intersection with National Routes 36 and 230 in Sapporo. It travels northeast across the western side of Hokkaido to Asahikawa where it ends at an intersection with National Routes 39 and 40.