1998 Japanese motorcycle Grand Prix
The 1998 Japanese motorcycle Grand Prix was the first round of the 1998 Grand Prix motorcycle racing season. It took place on 5 April 1998 at the Suzuka Circuit.Source:250 cc classification
Source:125 cc classification
Source:Championship standings after the race (500cc)
Below are the standings for the top five riders and constructors after round one has concluded.
;Riders' Championship standings
;Constructors' Championship standings
| Constructor | Points |
| 1 |  Honda | 25 |
| 2 | Yamaha | 16 |
| 3 | Suzuki | 10 |
| 4 |  Modenas KR3 | 5 |
| 5 |  MuZ | 4 |
- Note: Only the top five positions are included for both sets of standings.
Max Biaggi
Àlex Crivillé