1999 Japanese motorcycle Grand Prix
The 1999 Japanese motorcycle Grand Prix was the second round of the 1999 Grand Prix motorcycle racing season. It took place on 25 April 1999 at the Twin Ring Motegi.250 cc classification
125 cc classification
Championship standings after the race (500cc)
Below are the standings for the top five riders and constructors after round two has concluded.
;Riders' Championship standings
;Constructors' Championship standings
| Constructor | Points |
| 1 |  Suzuki | 50 |
| 2 | Yamaha | 36 |
| 3 | Honda | 36 |
| 4 |  Modenas KR3 | 4 |
| 5 |  Aprilia | 3 |
- Note: Only the top five positions are included for both sets of standings.
Kenny Roberts Jr.
Mick Doohan
Carlos Checa
Alex Barros