title: Ōsensei
text: # Ōsensei
  
  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
  * O-Sensei, a fictional character in the DC Universe
  