| Ōi no Mikado Reishi Japanese: 大炊御門麗子 | |
| Succession: | Empress consort of Japan |
| Reign: | July 28, 1205 – April 14, 1210 |
| Consort: | yes |
| Spouse: | Emperor Tsuchimikado |
| Royal House: | Imperial House of Japan |
| Father: | Fujiwara no Yorizane |
| Mother: | Fujiwara no Takako (藤原隆子) |
| Birth Date: | 1185 |
| Death Place: | Heian-kyō (Kyōto) |
Fujiwara no Reishi (藤原 麗子; 1185 – November 1, 1243), also known as Ōi no Mikado Reishi (大炊御門 麗子), was an empress consort of Japan. She was the consort of Emperor Tsuchimikado of Japan. Her honorary name was Onmei Mon'in (陰明門院).
In 1221, on the first month of the Jōkyū era she ordained as a Buddhist nun and received the Dharma name Seijōmyō (清浄妙).[1]