The rensho (連署: “co-signatory”) was the assistant to the shikken (regent) of the Kamakura shogunate in Japan.

The rensho placed his signature next to that of the shikken on official orders. In 1224 the third shikken Hojo Yasutoki appointed Hojo Tokifusa as the first rensho. From then on, the rensho was chosen from influential members of the Hojo clan, but not from the main line of the clan (tokuso), except in the case of Tokimune, who temporarily occupied the position from 1264 to 1268.

List of Rensho

1. Hojo Tokifusa (r. 1225–1240)
2. Hojo Shigetoki (r. 1247–1256)
3. Hojo Masamura (r. 1256–1264)
4. Hojo Tokimune (r. 1264–1268)
5. Hojo Masamura (r. 1268–1273)
6. Hojo Yoshimasa (r. 1273–1277)
7. Hojo Shigetoki (r. 1283–1287)
8. Hojo Nobutoki (r. 1287–1301)
9. Hojo Tokimura (r. 1301–1305)
10. Hojo Munenobu (r. 1305–1311)
11. Hojo Hirotoki (r. 1311–1312)
12. Hojo Sadaaki (r. 1315–1326)
13. Hojo Koresada (r. 1326–1327)
14. Hojo Shigetoki (r. 1330–1333)