Tatsushi Koyanagi (小柳 達司, born February 7, 1990) is a Japanese football player who plays as a defender for J2 League club Blaublitz Akita.

After graduating from Nippon Sport Science University, he joined J2 League club Thespa Kusatsu in 2012[3] and made his professional debut as a starter on 1 April.

[7] Koyanagi also scored the headed goal against Blaublitz Akita on Match week 26, 7 October 2018.

[11][12] In 2022, Koyanagi signed for Blaublitz Akita and gave an assist to Shota Aoki on Matchweek 8.

This biographical article related to a Japanese association football defender born in the 1990s is a stub.