The 1989 British League season (also known as the Sunbrite British League for sponsorship reasons) was the 55th season of the top tier of motorcycle speedway in the United Kingdom and the 25th known as the British League.
The Coventry Bees were the defending champions from 1988. The league was once again run over a 15-heat formula, with 7 riders per team.
Oxford Cheetahs bounced back to winning ways claiming their third title in five years. The team was led by their double world champion Hans Nielsen who by the end of the season would be world champion for the third time and top the averages for an incredible seventh season running. He was backed up by Simon Wigg, Martin Dugard, Andy Grahame, Marvyn Cox and Troy Butler, all of whom averaged from about 6 to 8 points for the season. The defending champions Coventry could only finish 5th after losing Tommy Knudsen for the season. Cradley Heath won their 8th Knockout Cup in 11 years (it would also be their last).
<small>M = Matches; W = Wins; D = Draws; L = Losses; Pts = Total Points</small>
The 1989 Speedway Star British League Knockout Cup was the 51st edition of the Knockout Cup for tier one teams. Cradley Heath Heathens were the winners for the fourth successive year if including the tied 1986 final.
First round
Quarter-finals
Semi-finals
Final
First leg
Second leg
Cradley Heath were declared Knockout Cup Champions, winning on aggregate 95-85.
Shawn Moran won the British League Riders' Championship. It was the held at Belle Vue Stadium on 1 October.
North Group
South Group
North Group
South Group
Final
Belle Vue
Bradford
Coventry
Cradley Heath
Kings Lynn
Oxford
Reading
Swindon
Wolverhampton