| Native Name: | 両國 勇治郎 |
| Ryōgoku Kajinosuke II | |
| Birth Name: | Yujiro Nishimura |
| Birth Date: | 18 March 1892 |
| Birth Place: | Daisen, Akita, Japan |
| Weight: | 90kg (200lb) |
| Heya: | Dewanoumi |
| Record: | 92-72-34-2draws-1hold (makuuchi) |
| Debut: | June 1909 |
| Highestrank: | Sekiwake (June 1915) |
| Eldername: | Takekuma |
| Retireddate: | January 1924 |
| Yushos: | 1 (Makuuchi) |
| Update: | June 2020 |
Ryōgoku Kajinosuke II (両國 勇治郎, March 18, 1892 – August 10, 1960) was a Japanese sumo wrestler. His highest rank was sekiwake.
He made a debut in June 1909. He reached the top makuuchi division in May 1914 and won the championship with a 9-0-1 record.[1] Until Takerufuji in March 2024, he was the only wrestler since the creation of the official championship system in 1909 to win the top division championship at his first attempt.[2] After the win, he changed his shikona from Ryōgoku Yūjirō to Ryōgoku Kajinosuke. He reached sekiwake rank in January 1915 but was unable to climb any higher and spent most of the rest of his career as a maegashira. He retired in January 1924. After retirement, he worked under the name Takekuma in the Dewanoumi ichimon, and recruited Musashiyama. However, he later left the Dewanoumi ichimon and established Takekuma stable.