Keiji Oyama (小山 桂司; born November 19, 1980) is a Japanese former professional baseball catcher in Japan's Nippon Professional Baseball.

He played for the Hokkaido Nippon-Ham Fighters in 2008, the Chunichi Dragons from 2009 to 2011, and for the Tohoku Rakuten Golden Eagles from 2012 to 2015.

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