Ōizumimachi (Japanese: 大泉町) is a district of Nerima, Tokyo, Japan. It consists of 1-chōme to 6-chōme. It is best known for Ōizumi Junction and Ōizumi Interchange located in the district. Note that Ōizumimachi and Ōizumigakuenchō are completely different districts of Nerima.
Ōizumimachi is located in the northwestern part of Nerima. It borders Wakō, Saitama on the north, Higashiōizumi on the south, Miharadai on the southeast, Doshida on the east, Ōizumigakuenchō on the west.
Ōizumimachi, Nerima, Tokyo roughly corresponds to former-time Hashido, Niikura District, Musashi (武蔵国新座郡橋戸村 Musashi-no-kuni Niikura-gun Hashido-mura). Its name was changed to Hashido, Kurehashi, Niikura District, Saitama (埼玉県新座郡榑橋村大字橋戸 Saitama-ken Niikura-gun Kurehashi-mura ōaza Hashido) in 1889, Hashido, Ōizumi, Kitatoshima District, Tokyo (東京府北豊島郡大泉村大字橋戸 Tokyo-fu Kitatoshima-gun Ōizumi-mura ōaza Hashido) in 1891, Kitaōizumimachi, Itabashi, Tokyo City, Tokyo (東京府東京市板橋区北大泉町 Tokyo-fu Tokyo-shi Itabashi-ku Kitaōizumimachi) in 1932, and Kitaōizumimachi, Nerima, Tokyo (東京都練馬区北大泉町 Tokyo-to Nerima-ku Kitaōizumimachi) in 1947.
In 1980, most part of Kitaōizumimachi and a portion of Ōizumigakuenchō were merged to become Ōizumimachi 1-chōme to 5-chōme. Finally in 1982, the rest of Kitaōizumimachi and a portion of Ōizumigakuenchō were merged to become Ōizumimachi 6-chōme.