| Uchi | 内 | inside | |
| Uchi | 打 | strike, blow | |
| Uchideshi | 内 弟 子 | Live-in student, private disciple |  |
| Uchiwa | 団 扇 | fan |  |
| Uchiwanage | 団 扇 投 げ | fan throw | |
| Ude | 腕 | forearm | |
| Ude Osae | 腕 押 | control arm | |
| Udefuri | 腕 振 り | shake arms | |
| Uke | 受 け | the one receiving the aikido technique | |
| Ukemi | 受 け 身 | receiving, falling, rolling |  |
| Undo | 運 動 | movement | |
| Ura | 裏 | back side | |
| Uragaeshi | 裏 返 し | inside out, upside down | |
| Uragei | 裏 芸 | hidden arts - techniques without sword | |
| Ushiro | 後 ろ | backward | |
| Ushiro Ukemi | 後 ろ 受 け 身 | rolling backward | |
| Ushirokatatori | 後 ろ 肩 取 り | grab shoulder from behind | |
| Ushiroryokatatori | 後 ろ 両 肩 取 り | grab shoulders from behind | |
| Ushirotekubitori | 後 ろ 手 首 取 り | grab both wrists from behind | |
| Ushirotori | 後 ろ 取 り | embrace from behind | |