The regular season commenced on September 12, 1998, and ended on April 4, 1999, with a total of 13 teams competing, playing 36 games each.
[1] Sheffield Sharks were a dominant force throughout the season, winning the Sainsbury's Classic Cola Cup whilst storming the Budweiser League and taking the Championship to complete the "Double".
Their successful run fell short in the play-offs however, managing only a third-placed finish thus allowing a new-look London Towers to claim the title.
No teams participated in European competition after Birmingham Bullets and Greater London Leopards both declined to compete in the Saporta Cup.
(1) Sheffield Sharks vs. (8) Greater London Leopards (2) Manchester Giants vs. (7) Birmingham Bullets (3) London Towers vs. (5) Newcastle Eagles (4) Thames Valley Tigers vs. (6) Derby Storm Champions by virtue of head-to-head record* Quarter-finals Semi-finals Final Quarter-finals Semi-finals Final Quarter-finals Semi-finals Final Group A Group B Derby Storm vs. Leicester Riders Sheffield Sharks vs. Manchester Giants