Kōsaku
Kōsaku, Kosaku or Kousaku is a masculine Japanese given name. Notable people with the name include:
- Kosaku Akimoto, Japanese baseball player
- Kōsaku Aruga, Imperial Japanese Navy admiral
- Kōsaku Hamada, Japanese archaeologist and academic
- Kosaku Masuda, Japanese footballer
- Kōsaku Matsumora, Japanese karateka
- Satoyama Kosaku, Japanese sumo wrestler
- Kosaku Shimada, Japanese golfer
- Kōsaku Takii, Japanese poet and writer
- Kosaku Yamada, Japanese composer and conductor
- Yoshio Kōsaku, Japanese physician and translator
- Kōsaku Yosida, Japanese mathematician
