Ryōtarō, Ryotaro, Ryoutarou or Ryohtaroh is a masculine Japanese given name. Notable people with the name include:

• Ryotaro Azuma (1893–1983), Japanese physician and bureaucrat, Governor of Tokyo 1959 to 1967
• Ryotaro Ishida (石田 凌太郎, born 2001), Japanese footballer
• Ryotaro Ito (伊藤 涼太郎, born 1998), Japanese footballer
• Ryotaro Meshino (食野 亮太郎, born 1998), Japanese footballer
• Ryōtarō Okiayu (born 1969), Japanese voice actor
• Ryōtarō Shiba (1923–1996), Japanese author
• Ryotaro Shimizu (清水 良太郎, born 1988), Japanese actor and impressionist
• Ryōtarō Sugi (born 1944), Japanese singer and actor
• Ryotaro Tanose (born 1943), Japanese politician of the Liberal Democratic Party
• Ryotaro Yamamoto (山本 凌太郎, born 1998), Japanese footballer

• Ryotaro Nogami, a character from Kamen Rider Den-O
• Ryotaro Dojima (堂島 良太郎), a character in Persona 4

• Ryūtarō