Hiroki Kumoyama

is a Japanese rugby union player who plays as a fullback. He currently plays for Hanazono Kintetsu Liners in Japan's domestic Japan Rugby League One.

Early career Kumoyama is from Nishinomiya and attended Hōtoku Gakuen High School where he first played rugby and was selected for Japan while at high school. After school, he attended Meiji University where he also played rugby between 2018 and 2022.

Professional career While still a university student, Kumoyama signed for the Japanese Super Rugby side the Sunwolves, being named as part of their squad for the 2020 Super Rugby season. He did not make an appearance for the side. After graduating he signed for the Tokyo Sungoliath in 2022, making his debut in January 2023. He would only make one further appearance for the side due to competition for places, before joining Hanazono Kintetsu Liners ahead of the 2025 season.