Kotonowaka Masahiro (Japanese: 琴ノ若 傑太, born November 19, 1997 as Masakatsu Kamatani (鎌谷 将且, Kamatani Masakatsu)) is a Japanese professional sumo wrestler from Chiba Prefecture. He made his debut in November 2015 and reached the top makuuchi division in March 2020. He wrestles for Sadogatake stable. His highest rank has been maegashira 1. He is the son of former sekiwake Kotonowaka Terumasa (who is also his stablemaster) and grandson of 53rd yokozuna Kotozakura Masakatsu.