The 16th unified local elections in Japan took place in April 2007.
In the second phase on April 22, 2007 mayors and/or assemblies in hundreds of cities, special wards, towns and villages were up for election.
Additionally, by-elections for the national Diet were held in Fukushima and Okinawa on April 22.
Elections with national media coverage included the mayoral races in five prefectural capitals (Mito, Ibaraki; Takamatsu, Kagawa; Matsuyama, Ehima; Nagasaki, Nagasaki: Tomihisa Taue won the election to succeed assassinated mayor Itchō Itō; Ōita, Ōita), in the bankrupt city of Yūbari, Hokkaidō, and in Tōyō, Kōchi where an opponent of a planned site for highly radioactive waste won the election.
The House of Councillors by-elections were won by one LDP-Kōmeitō supported candidate (Aiko Shimajiri in Okinawa) as replacement for OSMP Councillor Keiko Itokazu, and one Democrat (Teruhiko Mashiko in Fukushima) as replacement for Democrat Yūhei Satō, producing a net gain of one seat for the ruling centre-right coalition three months before the regular House of Councillors election of 2007.