The year 2003 was the third year in the history of Deep, a mixed martial arts promotion based in Japan. In 2003 Deep held 8 events beginning with, Deep: 8th Impact.
Deep: clubDeep Osaka was an event held on December 7, 2003, at the Delfin Arena in Osaka, Japan.
Deep: clubDeep West Chofu was an event held on November 24, 2003, at the West Chofu Combat Sports Arena in Tokyo, Japan.
Deep: 12th Impact was an event held on September 15, 2003, at the Ota Ward Gymnasium in Tokyo, Japan.
Deep: 11th Impact was an event held on July 13, 2003, at the Grand Cube in Osaka, Japan.
Deep: 10th Impact was an event held on June 25, 2003, at Korakuen Hall in Tokyo, Japan.
Deep: clubDeep: Challenge in Club Ozon was an event held on May 25, 2003, at Club Ozon in Nagoya, Japan.
Deep: 9th Impact was an event held on May 5, 2003, at Korakuen Hall in Tokyo, Japan.
Deep: 8th Impact was an event held on March 4, 2003, at Korakuen Hall in Tokyo, Japan.