The 1998 Westar Rules Grand Final was an Australian rules football game contested between East Fremantle and West Perth on Sunday, 20 September 1998, at Subiaco Oval in Perth, Western Australia to determine the premier team of Westar Rules for the 1998 season. East Fremantle won convincingly by forty-three points, 20.10 (130) to 13.9 (87), taking out their twenty-ninth premiership but their last as of 2022. Adrian Bromage (East Fremantle) won the Simpson Medal as best on ground, completing a rare double of winning the Sandover Medal and Simpson Medal in the same season.