1999 Catalan motorcycle Grand Prix
The 1999 Catalan motorcycle Grand Prix was the sixth round of the 1999 Grand Prix motorcycle racing season. It took place on 20 June 1999 at the Circuit de Catalunya.
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 six has concluded.
;Riders' Championship standings
;Constructors' Championship standings
| Constructor | Points |
| 1 |  Honda | 136 |
| 2 | Yamaha | 96 |
| 3 | Suzuki | 74 |
| 4 |  Aprilia | 45 |
| 5 |  MuZ Weber | 25 |
- Note: Only the top five positions are included for both sets of standings.
Àlex Crivillé
Kenny Roberts Jr.