1999 Italian motorcycle Grand Prix

The 1999 Italian motorcycle Grand Prix was the fifth race of the 1999 Grand Prix motorcycle racing season. It took place on 6 June 1999 at the Mugello Circuit.

250 cc classification
Loris Capirossi was black-flagged for causing Marcellino Lucchi's crash at the start of the race; in addition, as he did not return to the pits within one lap after having been shown the flag, he was banned from the following event.

Championship standings after the race (500cc)
Below are the standings for the top five riders and constructors after round five has concluded.


 * Riders' Championship standings


 * Constructors' Championship standings


 * Note: Only the top five positions are included for both sets of standings.