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| Name | In-House Group | Constituency/Area |
|---|---|---|
| OBUCHI Yuko | LDP | Gunma 5th District |
| OCHIAI Takayuki | CDP | Tokyo 6th District |
| ODAKE Kai | DPFP | Hokuriku-Shinetsu Bloc |
| OGATA Rintaro | YK | Fukuoka 9th District |
| OGAWA Junya | CDP | Kagawa 1st District |
| OGUMA Shinji | CDP | Fukushima 3rd District |
| OGUSHI Hiroshi | CDP | Saga 2nd District |
| OGUSHI Masaki | LDP | Kinki Bloc |
| OHKAWARA Masako | CDP | Tokyo 21st District |
| OHNO Keitaro | LDP | Kagawa 3rd District |
| OHSAKA Seiji | CDP | Hokkaido 8th District |
| OISHI Akiko | * | Kinki Bloc |
| OKADA Hanako | CDP | Aomori 3rd District |
| OKADA Katsuya | CDP | Mie 3rd District |
| OKADA Satoru | CDP | Kinki Bloc |
| OKAJIMA Kazumasa | CDP | Minami Kanto Bloc |
| OKAMOTO Akiko | CDP | Miyagi 1st District |
| OKAMOTO Mitsunari | KM | Tokyo 29th District |
| OKAMOTO Mitsunori | CDP | Aichi 9th District |
| OKANO Junko | DPFP | Minami Kanto Bloc |
| OKUNO Soichiro | CDP | Chiba 9th District |
| OKUSHITA Takemitsu | JIP | Osaka 7th District |
| OMORI Eriko | KM | Tokyo Bloc |
| ONIKI Makoto | LDP | Kyushu Bloc |
| ONISHI Kensuke | CDP | Aichi 13th District |
| ONISHI Youhei | LDP | Tokyo 16th District |
| ONODERA Itsunori | LDP | Miyagi 5th District |
| OOKA Toshitaka | LDP | Kinki Bloc |
| OSHIMA Atsushi | CDP | Saitama 6th District |
| OTAKE Rie | CDP | Tokai Bloc |
| OTSUJI Kanako | CDP | Kinki Bloc |
| OTSUKA Sayuri | CDP | Kanagawa 20th District |
| OTSUKI Kureha | CDP | Hokkaido 4th District |
| OZAKI Masanao | LDP | Kochi 2nd district |
| OZAWA Ichiro | CDP | Iwate 3rd District |
| OZORA Koki | LDP | Tokyo Bloc |
Notes:
* No abbreviation
List of the In-House Groups in the House
District: Single-seat constituency
Bloc: Proportional representation area
In-House Group: A group of House Members who engage in joint activities within the House. Usually, a political party forms an in-House group inside the House, but occasionally there are cases where a group is formed by (1) House Members who do not belong to a particular political party, (2) a political party and a House Member or Members who do not belong to any political party, or (3) two or more political parties.