Katsuhiko Sumii (角居 勝彦, Sumii Katsuhiko) (born 28 March 1964, Kanazawa, Ishikawa) is a Japanese horse trainer.

He trained the first and second placing horses in the 2006 Melbourne Cup, Delta Blues and Pop Rock.

[1] Other notable horses Sumii has trained include Kane Hekili, Vodka, Victoire Pisa, and Epiphaneia.

Sumii retired in February 2021 to succeed his mother's work as an active member of the Tenrikyo.

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