As manager As coach Masaaki Mori (森 祇晶, Mori Masaaki, born January 9, 1937) is a retired professional Japanese baseball player and manager.

Mori played Nippon Professional Baseball from 1955–1974 as the catcher of the Yomiuri Giants.

He was selected to eleven Nippon Professional Baseball All-Star Games.

After his retirement as a player, Mori managed the Seibu Lions from 1986–1994, leading the team to 6 of the 8 Japan Series championships of the Invincible Seibu dynasty.

Mori participated in 27 of the 73 Japan Series contested, as a player, coach, and manager, as of 2023, with him winning 21 of the 27, making him the most decorated individual in NPB history.