Bungo-Ōno is a city in Ōita Prefecture, Japan. It is located in the Bungo region of the prefecture, on the island of Kyushu.
As of 30 November 2023, the city had an estimated population of 32,846, living in 15,706 households, with a population density of 54 persons per square kilometre. Its total area is 603.13 square kilometres (232.87 square miles).
The city's low population density reflects its large area relative to its population, with much of the municipality made up of sparsely settled land.