Katsuya Toyama (當山克也 , Tōyama Katsuya, born July 21, 1967) is a Japanese sprint canoer who competed in the late 1980s and early 1990s. At the 1988 Summer Olympics in Seoul, he was eliminated in the semifinals of the C-2 1000 m event. Four years later in Barcelona, Toyama was eliminated in the semifinals of both the C-2 500 m and the C-2 1000 m events.

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