The 1991 World Judo Championships were the 17th edition of the World Judo Championships, and were held in Barcelona, Spain from July 25 to July 28, 1991.

The World Judo Championships are the highest level of international judo competition, along with the Olympic judo competition. The championships are held once every year (except the years when the Olympics take place) by the International Judo Federation, and qualified judoka compete in their respective categories as representatives of their home countries. Team competitions have also been held since 1994. The men's championships began in 1956, though the format and periodicity of the championships have changed overtime. The 28th edition of the championships took place in Paris, France in 2011.

The first edition of the world championships took place in Tokyo, Japan in 1956. There were no weight classes at the time and Japanese judoka Shokichi Natsui became the first world champion in history, defeating fellow countryman Yoshihiko Yoshimatsu in the final. The second world championship was also held in Tokyo two years later, with the Japanese winning the top two spots in the competition for the second time. In 1961, the championship was held outside of Japan for the first time, and Dutch judoka Anton Geesink defeated the prior world champion, Koji Sone, in Paris, France, to become the first non-Japanese world champion.

Reginald William David Marques (9 December 1932 – 29 September 2010) was an English rugby union international lock forward. At club level he represented Cambridge University, the Army and most notably Harlequin F.C.. He played international rugby with England and in 1959 he was selected to tour New Zealand and Australia with the British Lions.

Marques was born in Ware, Hertfordshire in 1932, and was educated at Yardley Court School and later at Tonbridge School where he played in the rugby first XV alongside Colin Cowdrey. Marques completed his national service with the Royal Engineers before matriculating to Cambridge University. After retiring from rugby he joined the family firm making street lights.

In 1964 Marques was a member of the 1964 America's Cup challenger team, aboard the Sovereign. He was also a magistrate, a governor for Haileybury College and a church warden for 23 years. He was married with three children.

Marques came to note as a rugby player when he represented Cambridge University, playing in four Varsity Matches. He later played for the Army, but it was his eleven years spent with Harlequins that he was best known. In 1956 he was selected to play for invitational tourists the Barbarians, playing against the 1958 Australians and then travelled with the Barbarians on their tours to Canada and South Africa. 1956 was also the year in which Marques was first selected to play for the England national team, facing Wales as part of the 1956 Five Nations Championship.