The 1990-91 Australian Baseball League championship was won by Perth Heat who defeated the Daikyo Dolphins 3–2 in the 5 game championship series.
| Team | Played | Wins | Loss | Win % | |
|---|---|---|---|---|---|
| Perth Heat | 5 | 3 | 2 | ||
| Daikyo Dolphins | 5 | 2 | 3 | ||
| 3rd | |||||
| 4th | |||||
| 5th | |||||
| 6th | |||||
| 7th | |||||
| 8th |
| Award | Person | Team | |
|---|---|---|---|
| Most Valuable Player | David Nilsson[1] | Daikyo Dolphins | |
| Championship M.V.P. | Graeme Lloyd | Perth Heat | |
| Golden Glove | Billy White | Sydney Wave | |
| Batting Champion | John Jaha | Daikyo Dolphin | |
| Rookie of the Year | Pat Leinen | Perth Heat | |
| Pitcher of the Year | Myles Barnden | Waverley Reds | |
| Manager of the Year |
| + Defensive Stats | |||||
| Name | Wins | Losses | Saves | ERA | |
|---|---|---|---|---|---|
| Dave Rusin | 3 | 1 | 0 | 1.80 | |
| Graeme Lloyd | 9 | 4 | 0 | 2.62 | |
| Simon Eissens | 4 | 1 | 0 | 2.81 | |
| Pat Leinen | 11 | 3 | 0 | 2.86 | |
| Parris Mitchell | 5 | 2 | 1 | 3.76 | |
| Todd Stephan | 8 | 3 | 2 | 5.34 |
| + Offensive Stars | |||
| Name | Avg | HR | RBI |
|---|---|---|---|
| T.R. Lewis | .394 | 5 | 32 |
| Tony Adamson | .379 | 17 | 54 |
| Tim Holland | .370 | 7 | 39 |
| James Waddell | .329 | 1 | 14 |
| Shaun Hrabar | .303 | 0 | 7 |
| Michael Moyle | .295 | 5 | 25 |
| Position | Name | Team | |
|---|---|---|---|
| Catcher | David Nilsson | Daikyo Dolphins | |
| 1st Base | John Jaha | Daikyo Dolphins | |
| 2nd Base | Andrew Scott | Adelaide Giants | |
| 3rd Base | T.R. Lewis | Perth Heat | |
| Short Stop | Billy White | Sydney Wave | |
| Out Field | Ron Carothers | Waverley Reds | |
| Out Field | Tim Holland | Perth Heat | |
| Out Field | Wayne Harvey | Parramatta Patriots | |
| Designated Hitter | Ron Johnson | Daikyo Dolphins | |
| Starting Pitcher | Pat Leinen | Perth Heat | |
| Relief Pitcher | Bob Nilsson | Daikyo Dolphins | |
| Manager | Phil Alexander | Adelaide Giants |