| Birth Date: | January 10, 1956 |
| Occupation: | Japanese politician |
| Party: | Japanese Communist Party |
| Alma Mater: | Kobe University |
| Mikishi Daimon | |
| Office: | Member of the House of Councillors |
| Termstart: | 22 October 2024 |
| Constituency: | National PR block |
| Termstart1: | January 2001 |
| Termend1: | 25 July 2022 |
| Constituency1: | National PR block |
| Birth Place: | Kyoto, Kyoto |
| Native Name: | 大門 実紀史 |
is a Japanese politician of the Japanese Communist Party, a member of the House of Councillors in the Diet (national legislature). A native of Kyoto, Kyoto and dropout of Kobe University, he was elected to the House of Councillors for the first time in 2001 after an unsuccessful run in 1998.