Ryo Miyaichi is a Japanese professional footballer who plays as a winger. He was born on December 14, 1992, in Okazaki, Japan. He joined Arsenal in 2011 and made limited first-team appearances. During his time at the club, he had loan spells at Feyenoord, Bolton Wanderers, Wigan Athletic, and FC Twente. In 2015, he signed for FC St. Pauli in Germany. He later joined Yokohama F. Marinos. At international level, he has represented the Japan national team and earned caps. He currently plays for Yokohama F. Marinos.