The 1998 British Formula Three season was the 48th British Formula Three Championship season. It commenced on 22 March, and ended on 4 October after sixteen races. Mario Haberfeld was the champion, while Phillip Scifleet won the Class B championship. The season was one of two halves as Enrique Bernoldi dominated the first half of the season and compatriot Haberfeld the second; ultimately the latter would prevail thanks in part to his stronger consistency.