| Grand Prix: | Belgian |
| Flag: | Belgium |
| Location: | Circuit de Spa-Francorchamps |
| Course Mi: | 8.774 |
| Course Km: | 14.120 |
| Race No: | 4 |
| Season No: | 6 |
| Date: | 17 July |
| Year: | 1949 |
| Fast Rider 500: | Arciso Artesiani |
| Fast Rider 500 Country: | Italy |
| Fast Rider 500 Bike: | Gilera |
| Fast Time 500: | 96.3mph |
| First Rider 500: | Bill Doran |
| First Rider 500 Country: | United Kingdom |
| First Rider 500 Bike: | AJS |
| Second Rider 500: | Arciso Artesiani |
| Second Rider 500 Country: | Italy |
| Second Rider 500 Bike: | Gilera |
| Third Rider 500: | Enrico Lorenzetti |
| Third Rider 500 Country: | Italy |
| Third Rider 500 Bike: | Moto Guzzi |
| Fast Rider 350: | Freddie Frith Bob Foster |
| Fast Rider 350 Country: | UK |
| Fast Rider 350 Bike: | Velocette Velocette |
| Fast Time 350: | 90.8mph |
| First Rider 350: | Freddie Frith |
| First Rider 350 Country: | United Kingdom |
| First Rider 350 Bike: | Velocette |
| Second Rider 350: | Bob Foster |
| Second Rider 350 Country: | United Kingdom |
| Second Rider 350 Bike: | Velocette |
| Third Rider 350: | Johnny Lockett |
| Third Rider 350 Country: | United Kingdom |
| Third Rider 350 Bike: | Norton |
| Fast Rider Sidecar: | Eric Oliver |
| Fast Rider Sidecar Country: | UK |
| Fast Rider Sidecar Bike: | Norton |
| Fast Passenger Sidecar: | Denis Jenkinson |
| Fast Passenger Sidecar Country: | UK |
| First Rider Sidecar: | Eric Oliver |
| First Rider Sidecar Country: | United Kingdom |
| First Passenger Sidecar: | Denis Jenkinson |
| First Passenger Sidecar Country: | United Kingdom |
| First Rider Sidecar Bike: | Norton |
| Second Rider Sidecar: | Frans Vanderschrick |
| Second Rider Sidecar Country: | Belgium |
| Second Passenger Sidecar: | Martin Whitney |
| Second Passenger Sidecar Country: | United Kingdom |
| Second Rider Sidecar Bike: | Norton |
| Third Rider Sidecar: | Ernesto Merlo |
| Third Rider Sidecar Country: | Italy |
| Third Passenger Sidecar: | Aldo Veglio |
| Third Passenger Sidecar Country: | Italy |
| Third Rider Sidecar Bike: | Gilera |
The 1949 Belgian motorcycle Grand Prix was the fourth round of the 1949 Grand Prix motorcycle racing season. It took place at the Circuit de Spa-Francorchamps.
British rider Bill Doran won the 500cc race riding his AJS from Arciso Artesiani and Enrico Lorenzetti.
By winning their second race of the 600 cc Sidecar of the season British Norton rider Eric Oliver and his swinger Denis Jenkinson wrapped up the first Sidecar championship before the third and final round to be held at the Nations Grand Prix. In the same race, Belgian sidecar rider Edouard Bruylant and his British passenger known as "Hurst" were killed.
| Pos | Rider | Manufacturer | Time | Points | |
|---|---|---|---|---|---|
| 1 | Bill Doran | AJS | 1:19:56.0 | 10 | |
| 2 |  Arciso Artesiani | Gilera | +0.2 | 9 | |
| 3 | Enrico Lorenzetti | Moto Guzzi | +1.3 | 7 | |
| 4 | Artie Bell | Norton | +50.0 | 6 | |
| 5 | Nello Pagani | Gilera | +1:08.0 | 5 | |
| 6 | Guido Leoni | Moto Guzzi | +1:14.0 | ||
| 7 | Harold Daniell | Norton | |||
| 8 |  George Morrison | Norton | |||
| 9 |  Syd Jensen | Triumph | |||
| 10 | Ken Bills | Velocette | |||
| 16 finishers | |||||
| [1] [2] | |||||
| Pos | Rider | Manufacturer | Time | Points | |
|---|---|---|---|---|---|
| 1 | Freddie Frith | Velocette | 1h 06m 14s | 10.5 | |
| 2 | Bob Foster | Velocette | +16s | 8.5 | |
| 3 | Johnny Lockett | Norton | +33s | 7 | |
| 4 | David Whitworth | Velocette | +1m 39s | 6 | |
| 5 | Eric McPherson | AJS | +2m 01s | 5 | |
| 6 |  Reg Armstrong | AJS | +2m 01s | ||
| 7 | Eric Oliver | Velocette | |||
| 8 | Enrico Lorenzetti | Moto Guzzi | |||
| 9 |  Louis van Rijswijk | Velocette | |||
| 10 | Tommy Wood | Velocette | |||
| 22 finishers | |||||
| [3] | |||||
| Pos | Rider | Passenger | Manufacturer | Time | Points | |
|---|---|---|---|---|---|---|
| 1 | Eric Oliver | Denis Jenkinson | Norton | 50m 07s | 11 | |
| 2 |  Frans Vanderschrick | Martin Whitney | Norton | +25s | 8 | |
| 3 | Ernesto Merlo | Dino Magri | Gilera | +1m 33s | 7 | |
| 4 |  Roland Benz | Max Hirzel | BMW | +1m 54s | 6 | |
| 5 | Pip Harris | Neil Smith | Norton | +2m 31s | 5 | |
| 6 | Raymond Rorsvort | Louis van Leemput | BMW | +4m 33s | ||
| 7 | Alphonse Vervroegen | ? | FN | |||
| 8 | Jean Debotze | ? | Norton | |||
| 8 finishers | ||||||
| [4] | ||||||