The 1988 Speedway Star British League Knockout Cup was the 50th edition of the
Knockout Cup for tier one teams.
Cradley Heath Heathens were the winners for the third 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
100-80. == Riders' Championship ==