Ōsensei (大先生/翁先生 great teacher, grand master) is a Japanese term, a stronger form of sensei (先生 teacher).
Ōsensei may also refer to:
- Morihei Ueshiba (1883–1969), founder of Aikido
- Masutatsu Oyama ( 1923–1994), founder of Kyokushinkai karate
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