Koizumi
- Akako Koizumi
- Ariane Koizumi
- Chikashi Koizumi
- Eiko Koizumi
- Gen-ichi Koidzumi
- Gunji Koizumi
- Guru Guru Pon-chan
- Hiroshi Koizumi (racing driver)
- Itsuki Koizumi
- Japanese name
- Junichiro Koizumi
- Junya Koizumi
- Kei Koizumi
- Koizumi Matajirō
- Koizumi Setsuko
- Koizumi Station (disambiguation)
- Koizumi family
- Kotaro Koizumi
- Kyōko Koizumi
- Lafcadio Hearn
- Little Ghost Q-Taro
- Love Live! School Idol Project
- Mika Koizumi
- Miyuki Koizumi
- Ms. Koizumi Loves Ramen Noodles
- Samurai (Super Friends)
- Shinjirō Koizumi
- Takashi Koizumi
- Yoshiaki Koizumi
- Yoshio Koizumi
- Young Justice (TV series)