Soko Yamaoka (山岡聡子, Yamaoka Sōko, born 29 May 1974 in Nagano) is a Japanese snowboarder.

She has competed in the halfpipe event at the 2006 Winter Olympics, where she placed 10th, and the 2010 Winter Olympics, where she placed 16th.

[1] She also competed at the World Snowboard Championships from 2003 through 2009.

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