Roy Yamaguchi Memorial Trophy is the sailing trophy awarded at the Women's Snipe World Championships. The Roy Yamaguchi Memorial Trophy is awarded to the winning skipper and her crew. Another trophy, the Carmen Diaz Trophy, donated by Augie Diaz, is awarded to the highest placing Junior Women’s team at the Women’s World Championship.
This competition is held every two years in the even numbered years since 1994.
The Roy Yamaguchi Memorial Trophy was donated by SCIRA Japan, and the responsibility for engraving, safeguarding and return of the Trophy to the following regatta rests with the winning skipper. It's named after Roy Yamaguchi, who was instrumental in organizing the Tokyo Bay Fleet, Japan’s first Snipe fleet, in 1956. He was also the first Japanese person to participate in the Open World Championship, in Cascais, Portugal, in 1957. In 1963, he died at the early age of 42.