Masaru Miyauchi (?? ?, Miyauchi Masaru, born June 13, 1984 in Otofuke, Hokkaido) is a Japanese bobsledder who has competed since 2009.
He finished 21st in the four-man event at the 2010 Winter Olympics in Vancouver, British Columbia, Canada.
Miyauchi's best World Cup finish was 25th in a four-man event at Park City, Utah in November 2009.