Yoshiharu Otani (died 3 June 1615), also called Yoshikatsu or Yoshitane Otani, was the son of Yoshitsugu Otani and brother-in-law of Yukimura Sanada. He fought at the Battle of Kuzegawa and Battle of Sekigahara in 1600 under his father and died in the Siege of Osaka after challenging Kojiro Sasaki to a duel.