Kōtarō Tanaka may refer to:
Kōtarō Tanaka (judge) (1890–1974), Japanese jurist, judge of the International Court of Justice, and politician Kōtarō Tanaka (photographer) (1901–1995), Japanese photographer Kōtarō Tanaka (actor) (born 1964), Japanese business executive and former actor Koutaro Tanaka (born 1982), or Kōtarō Tanaka, actor Kōtarō Tanaka, musician on "Stay the Ride Alive"