Kotaro

• Kotaro Azuse, Japanese baseball player
• Kotaro Honda, Japanese scientist and inventor
• Kōtarō Iizawa, Japanese photography critic and writer
• Kotaro Ikeda, Japanese painter
• Kōtarō Isaka, Japanese writer
• Kōtarō Kodama, Japanese politician
• Kotaro Koizumi, Japanese actor
• Kotaro Nagasaki, Japanese politician
• Kōtarō Nakagawa, Japanese composer and music arranger
• Kōtarō Nakamura, Japanese general
• Kotaro Omori, Japanese footballer
• Kotaro Oshio, Japanese guitarist
• Kotaro Otake, Japanese baseball player
• Kotaro Sakurai, Japanese racing driver
• Kōtarō Satomi, Japanese actor
• Kotaro Shimizu, Japanese hurdler
• Kotaro Shimomura, Japanese chemical engineer
• Kotaro Suzumura, Japanese economist and academic
• Kōtarō Takamura, Japanese poet and sculptor
• Kotaro Tamura, Japanese politician
• Kōtarō Tanaka (judge), Japanese jurist and politician
• Kōtarō Tanaka (photographer), Japanese photographer
• Kotaro Uchikoshi, Japanese video game director and scenario writer
• Kotaro Umeji, Japanese graphic designer
• Kotaro Yamazaki, Japanese footballer
• Kotaro Yanagi, Japanese actor
• Kotaro Yatabe, Japanese rugby union player
• Kōtarō Yoshida, Japanese jujutsuka

• Fūma Kotarō, Japanese ninja
• Kotaro Suzuki, Japanese professional wrestler
• Kotaro Tachikawa, Japanese footballer

Fictional characters

• Kotarou Higuchi, protagonist of the manga series Pita-Ten
• Kotarou Kashima, a character from the manga and anime School Babysitters, younger brother of Ryuichi Kashima
• List of Haikyu!! characters#Fukurodani Academy, a character in the manga series Haikyu!!
• Kotaro Tatsumi, a character in the anime series Zombie Land Saga
• Kotaro, a character in the 2007 anime samurai film Sword of the Stranger
• Kotaro Minami, the protagonist of the tokusatsu series Kamen Rider Black
• Satō Kotarō, the titular character of the manga and anime series Kotaro Lives Alone
• Kotaro Katsura, a character in the manga series ''Gintama''