Grands Prix
| Round | Date | Grand Prix | Circuit | 125cc winner | 250cc winner | 500cc winner | Report |
|---|---|---|---|---|---|---|---|
| 1 | April 5 | Japanese Grand Prix | Suzuka | Kazuto Sakata | Daijiro Kato | Max Biaggi | Report |
| 2 | April 19 | Malaysian Grand Prix | Johor | Noboru Ueda | Tetsuya Harada | Mick Doohan | Report |
| 3 | May 3 | Spanish Grand Prix | Jerez | Kazuto Sakata | Loris Capirossi | Àlex Crivillé | Report |
| 4 | May 17 | Italian Grand Prix | Mugello | Tomomi Manako | Marcellino Lucchi | Mick Doohan | Report |
| 5 | May 31 | French Grand Prix | Paul Ricard | Kazuto Sakata | Tetsuya Harada | Àlex Crivillé | Report |
| 6 | June 14 | Madrid Grand Prix | Jarama | Lucio Cecchinello | Tetsuya Harada | Carlos Checa | Report |
| 7 | June 27 | Dutch TT | Assen | Marco Melandri | Valentino Rossi | Mick Doohan | Report |
| 8 | July 5 | British Grand Prix | Donington | Kazuto Sakata | Loris Capirossi | Simon Crafar | Report |
| 9 | July 19 | German Grand Prix | Sachsenring | Tomomi Manako | Tetsuya Harada | Mick Doohan | Report |
| 10 | August 23 | Czech Republic Grand Prix | Brno | Marco Melandri | Tetsuya Harada | Max Biaggi | Report |
| 11 | September 6 | City of Imola Grand Prix | Imola | Tomomi Manako | Valentino Rossi | Mick Doohan | Report |
| 12 | September 20 | Catalan Grand Prix | Catalunya | Tomomi Manako | Valentino Rossi | Mick Doohan | Report |
| 13 | October 4 | Australian Grand Prix | Phillip Island | Masao Azuma | Valentino Rossi | Mick Doohan | Report |
| 14 | October 25 | Argentine Grand Prix | Buenos Aires | Tomomi Manako | Valentino Rossi | Mick Doohan | Report |
Read more about this topic: 1998 Grand Prix Motorcycle Racing Season