Masakatsu Ueda (born December 21, 1977) is a professional Japanese mixed martial arts fighter who currently competes in the bantamweight division(featherweight in Shooto) for Shooto where he is the current undisputed featherweight champion. Ueda won the vacant title after defeating Koetsu Okazai on March 28, 2008 by Unanimous Decision at Shooto's Back To Our Roots 8 show.

Since then Ueda has defended the title once against Marcos Galvao on September 28, 2008 at Shooto's Tradition 3 show, the fight was ruled a draw. Ueda was also a college level wrestler in Japan where holds a win over fellow Mixed Martial Artist and Japanese Superstar Norifumi Yamamoto, better known as "Kid" Yamamoto.

Although he is the Current Shooto World Featherweight Champion Ueda has also won many national titles in Combat Wrestling. He also won the All Japan Shooto Grappling championship, and both A and B class Shooto Rookie Tournaments.