| Personal information | |
|---|---|
| Native name | 数川 純子 |
| Full name | Junko Kazukawa |
| Nationality | Japanese |
| Born | 18 July 1963 Sapporo |
| Sport | |
| Country | United States |
| Event | Ultrarunning |
Junko Kazukawa (数川 純子 Kazukawa Junko, born 1963) is a Japanese-born ultrarunner who currently lives in Denver, Colorado, U.S. A two-time breast-cancer survivor, Kazukawa competes in marathon, ultramarathon and cycling events. She was the first person to complete the Leadville series and the Ultrarunning Grand Slam in a single year.