1991 Speedway Under-21 World Championship

The 1991 Individual Speedway Junior World Championship was the 15th edition of the World motorcycle speedway Under-21 Championships.

Brian Andersen won the final, defeating fellow Dane Morten Andersen in a run-off for the title after both riders had finished on 14 points.

Qualifying

 * 17 May Meissen Speedway Stadium, Meissen
 * 24 May 🏴󠁧󠁢󠁥󠁮󠁧󠁿 Belle Vue Stadium, Manchester
 * 30 May 🇸🇪 Grevby Motorstadion, Mariestad
 * 28 June Eichenring, Oberkrämer

Semi-finals

 * 12 July 🇵🇱 The Swallow's Nest, Tarnów
 * 12 July Brovst Speedway Center, Brovst

World final

 * 30 September 1991
 * 🏴󠁧󠁢󠁥󠁮󠁧󠁿 Brandon Stadium, Coventry