Ōita Expressway is a Japanese expressway in Kyushu that travels from Tosu to Hiji, where it connects to the Higashikyushu Expressway. It runs through the southern half of Fukuoka Prefecture, and the northern half of Ōita Prefecture. The total length of Ōita Expressway is 104.7 kilometres (65.1 mi).

Tosu is a city located in the eastern part of Saga Prefecture on the island of Kyushu, Japan. As of February 28, 2017, the city has an estimated population of 72,755 and a population density of 1,000 persons per km2. The total area is 71.73 km2.