| Ryumo Ono | |
| Position: | Forward |
| Height Ft: | 6 |
| Height In: | 6 |
| Team: | Toyama Grouses |
| Number: | 0 |
| League: | B.League |
| Nationality: | Japanese |
| Birth Date: | January 6, 1988 |
| Birth Place: | Tokyo, Japan |
| High School: | Kokugakuin University Kugayama High |
| College: | Chuo University |
| Career Start: | 2010 |
| Years1: | 2010–2013 |
| Team1: | Toyota Alvark |
| Years2: | 2013–2020 |
| Team2: | Chiba Jets |
| Years3: | 2020–2021 |
| Team3: | Shinshu Brave Warriors |
| Years4: | 2021–present |
| Team4: | Toyama Grouses |
is a Japanese professional basketball player for the Shinshu Brave Warriors club of the B.League in Japan.
He represented Japan's national basketball team at the 2015 FIBA Asia Championship in Changsha, China, where he was the team's best 3-point shooter.[1]
|-| align="left" | 2013-14| align="left" | Chiba| 39|| 37|| 33.2|| .370|| .341|| .616|| 5.1|| 1.8|| 0.8|| 0.2|| 14.3|-| align="left" | 2014-15| align="left" | Chiba| 46||43 || 30.8|| .371|| .332|| .750|| 3.8|| 1.8|| 1.0|| 0.3|| 12.2|-| align="left" | 2015-16| align="left" | Chiba| 55||55 || 28.6|| .343|| .284|| .676|| 4.1|| 1.8|| 0.7|| 0.3|| 8.6 |-| align="left" | 2016-17| align="left" | Chiba| 60 || 60||31.2 ||.411 ||.398 ||.670 ||3.1 ||2.4 || 0.6 ||0.2 || 12.3|-| align="left" | 2017-18| align="left" | Chiba| 59 || 59||27.1 ||.402 ||.365 ||.656 ||3.0 ||3.3 || 0.6 ||0.3 || 11.3|-|}