1991 Australian Under-21 Individual Speedway Championship
The 1991 Australian Under-21 Individual Speedway Championship was the 5th running of the Australian Under-21 Individual Speedway Championship organised by Motorcycling Australia. The final took place on 6 January 1991 at the Olympic Park Speedway in Mildura, Victoria. The championship was won by Mildura's own Leigh Adams who won the third of his four national Under-21 championships. Shane Parker from Adelaide was second with another Mildura rider Jason Lyons in third place. Parker defeated Lyons in a run-off for the minor placings after both finished the meeting on 13 points. Former South Australian champion Scott Norman defeated Dave Hamnett from New South Wales in a run-off for fourth place after both finished the meeting on 11 points.1991 Australian Under-21 Solo Championship
Pos. | Rider | Points | Details |
| Leigh Adams | 15 | |
| Shane Parker | 13+3 | |
| Jason Lyons | 13+2 | |
4 | Scott Norman | 11+3 | |
5 | Dave Hamnett | 11+2 | |
6 | Mark Lemon | 10 | |
7 | Damon Richardson | 8 | |
8 | Jason Hawkes | 7 | |
9 | Cory Alderton | 7 | |
10 | Matthew Poole | 6 | |
11 | Brett Tomkins | 6 | |
12 | John Reid | 6 | |
13 | Clinton Butler | 4 | |
14 | Jamie Plumb | 2 | |
15 | Ty Platt | 1 | |
16 | Steven Butler | 0 | |
17 | Reece Davison | - | did not ride |
18 | Steve Graetz | - | did not ride |