Kōsaku

Kōsaku, Kosaku or Kousaku (written: 功作, 宏作, 幸作, 耕作, 耕筰, 興作, 孝作 or 浩作) is a masculine Japanese given name. Notable people with the name include:


 * Kosaku Akimoto (秋元 宏作), Japanese baseball player
 * Aruga Kōsaku (有賀 幸作), Imperial Japanese Navy admiral
 * Kōsaku Hamada (濱田 耕作), Japanese archaeologist and academic
 * Kosaku Inaba (稲葉 興作), Singapore-born Japanese businessman
 * Kosaku Masuda (増田 功作), Japanese footballer
 * Kōsaku Matsumora (松茂良 興作), Japanese karateka
 * Satoyama Kōsaku (里山 浩作), Japanese sumo wrestler
 * Kosaku Shimada (島田 幸作), Japanese golfer
 * Kōsaku Takii (滝井 孝作), Japanese poet and writer
 * Kōsaku Yamada (山田 耕筰), Japanese composer and conductor
 * Kōsaku Yamashita (山下 耕作), Japanese film director
 * Yoshio Kōsaku (吉雄 幸作), Japanese physician and translator
 * Kōsaku Yosida (吉田 耕作), Japanese mathematician