Koki Ugusa (宇草 孔基, Ugusa Koki, born April 17, 1997) is a Japanese baseball pitcher for the Hiroshima Toyo Carp of Nippon Professional Baseball.

Ugusa played for Japan in the 2015 U-18 Baseball World Cup,[1] and graduated from Joso Gakuin High School [ja].

He then attended Hosei University, and played for the school's baseball team [ja].

After playing in the USA vs. Japan Collegiate All-Star Series,[1][2] Ugusa was selected by the Hiroshima Toyo Carp in the 2019 Nippon Professional Baseball draft as the team's second pick.

In his second professional season, Ugusa again spent time in the NPB and Western League.