Koo Ji-won (具智元, Gu Chigan, born 20 July 1994) is a Korean-Japanese professional rugby union player who plays as a prop for Japan Rugby League One club Kobelco Kobe Steelers.

Born in South Korea, he represents Japan at international level after qualifying on residency grounds.

[1][2][3][4] He also changed nationality to Japan after the 2019 World Cup After only two Super Rugby appearances for the Sunwolves, which included one start, Koo received his first call-up to his adopted country, Japan's senior squad ahead of the 2017 end-of-year rugby union internationals.

[5] This Japanese rugby union biography is a stub.

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