Kotaro Hayashi is a 25-year-old professional football player from JPN. He currently plays for Urawa Red Diamonds, wearing the number 18 shirt. He plays primarily as a Defender. He stands at 170cm tall and weighs 70kg. His preferred foot is Right. His current market value is estimated at 800K .

His most recent move was a from Machida Zelvia to Urawa Red Diamonds on 2026-07-01.

Throughout the Japanese J1 League 2026, Kotaro Hayashi featured in 4 matches, averaging 1 tackles, 0 interceptions, and 1.5 clearances per game, while blocking 0.3 shots per game.