The Yokkaichi Asunarou Railway Utsube Line (四日市あすなろう鉄道内部線, Yokkaichi Asunarō Tetsudō Utsube-sen) is a 762 mm (2 ft 6 in) narrow gauge railway line operated by the Japanese private railway company Yokkaichi Asunarou Railway, connecting Asunarou Yokkaichi Station and Utsube Station, both in the city of Yokkaichi, Mie, Japan. Until March 2015, the line was under control of Kintetsu, a major railway company.