Ōbu is a city located in Aichi Prefecture, Japan. As of 1 October 2019, the city had an estimated population of 92,179 in 39,382 households, and a population density of 2,739 persons per km2. The total area of the city is 33.66 square kilometres. Ōbu has been a member of the World Health Organization’s Alliance for Healthy Cities since June 5, 2000.