The 1949 Nations Grand Prix was the fifth round of the 1949 Grand Prix motorcycle racing season. It took place at the Autodromo Nazionale Monza.
Italian rider Nello Pagani won the 500 cc race riding a Gilera from Arciso Artesiani and Bill Doran.
Despite Dario Ambrosini winning the 250 cc race, a fourth-place finish for Italian Moto Guzzi rider Bruno Ruffo was enough for him to win the 250 cc championship, the only championship in the first season with results close enough to be still in doubt at the final race.
500 cc classification Pos Rider Manufacturer Time Points 1 Nello Pagani Gilera 1:16:36.8 11 2 Arciso Artesiani Gilera +0.8 8 3 Bill Doran AJS +15.8 7 4 Guido Leoni Moto Guzzi +18.2 6 5 Bruno Bertacchini Moto Guzzi +31.2 6 6 Reg Armstrong AJS +1:03.6 15 finishers
250 cc classification Pos Rider Manufacturer Time Points 1 Dario Ambrosini Benelli 1:02:53.8 11 2 Gianni Leoni Moto Guzzi +32.6 8 3 Umberto Masetti Benelli +52.2 7 4 Bruno Ruffo Moto Guzzi 6 5 Claudio Mastellari Moto Guzzi 5 6 Bruno Francisci Moto Guzzi
125cc classification Pos. Rider Manufacturer Laps Time/Retired Points 1 Gianni Leoni FB-Mondial 18 54:16.0 11 2 Umberto Masetti Moto Morini 18 +`1:03.0 8 3 Umberto Braga FB-Mondial 18 +1:18.0 7 4 Renato Magi Moto Morini 18 +1:40.4 6 5 Nello Pagani FB-Mondial 18 +2:30.8 5 16 starters, 13 finishers Source:
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