Kotaro, Kōtarō or Kotarō (written: 小太郎, 孝太郎, 鼓太郎, 康太郎, 光太郎, 功太郎, 浩太朗, 浩太郎, 耕太郎, 幸太郎, 誇太郎, 晃太郎, 興太郎 or コータロー in katakana) is a masculine Japanese given name. Notable people with the name include:
Kotaro Azuse (東瀬 耕太郎) (born 1967), Japanese baseball player
Fūma Kotarō (風魔 小太郎) (died 1603), Japanese ninja
Kotaro Honda (本多 光太郎) (1870 1954), Japanese scientist and inventor
Kōtarō Iizawa (飯沢 耕太郎) (born 1954), Japanese photography critic and writer
Kōtarō Isaka (伊坂 幸太郎) (born 1971), Japanese writer
Kotaro Koizumi (小泉 孝太郎) (born 1978), Japanese actor
Kotaro Nagasaki (長崎 幸太郎) (born 1968), Japanese politician
Kōtarō Nakagawa (中川 幸太郎) (born 1969), Japanese composer and music arranger
Kōtarō Nakamura (中村 孝太郎) (1881–1947), Japanese general
Kotaro Nakao (中尾 幸太郎) (born 1969), Japanese footballer and manager
Kotaro Omori (大森 晃太郎) (born 1992), Japanese footballer
Kotaro Oshio (押尾 コータロー) (born 1968), Japanese guitarist
Kotaro Sakurai (桜井 孝太郎) (born 1994), Japanese racing driver
Kōtarō Satomi (里見 浩太朗) (born 1936), Japanese actor
Kotaro Shimomura (下村 孝太郎) (1861–1937), Japanese chemical engineer
Kotaro Suzuki (鈴木 鼓太郎) (born 1978), Japanese professional wrestler
Kotaro Suzumura (鈴村 興太郎) (born 1944), Japanese economist and academic
Kōtarō Takamura (高村 光太郎) (1883–1956), Japanese poet and sculptor
Kotaro Tamura (田村 耕太郎) (born 1963), Japanese politician
Kōtarō Tanaka (judge) (田中 耕太郎) (1890–1974), Japanese jurist and politician
Kōtarō Tanaka (photographer) (田中 幸太郎) (1901–1995), Japanese photographer
Kotaro Umeji, Japanese graphic designer
Kotaro Yamazaki (山崎 光太郎) (born 1978), Japanese footballer
Kotaro Yanagi (柳 浩太郎) (born 1985), Japanese actor
Kōtarō Yoshida (吉田 幸太郎) (1883–1966), Japanese jujutsuka
