The 1998 Australian motorcycle Grand Prix was the thirteenth round of the 1998 Grand Prix motorcycle racing season. It took place on 4 October 1998 at the Phillip Island Grand Prix Circuit.
125 cc classification
==Championship standings after the race (500cc)==
Championship standings after the race (500cc)
Below are the standings for the top five riders and constructors after round thirteen has concluded. ;Riders' Championship standings ;Constructors' Championship standings • Note: Only the top five positions are included for both sets of standings. ==References==