| Type: | GP |
| Country: | Belgium |
| Grand Prix: | Frontières |
| Date: | 5 June |
| Year: | 1949 |
| Official Name: | XVIII Grand Prix des Frontières |
| Location: | Chimay, Belgium |
| Course: | Temporary street circuit |
| Course Length: | 10.87km (06.75miles) |
| Distance Laps: | 15 |
| Distance Length: | 163.04km (101.31miles) |
| Fast Driver: | Guy Mairesse |
| Fast Team: | Talbot-Lago |
| Fast Time: | 4:32.6 |
| Fast Country: | FRA |
| First Driver: | Guy Mairesse |
| First Country: | FRA |
| First Team: | Talbot-Lago |
| Second Driver: | Lance Macklin |
| Second Country: | GBR |
| Second Team: | Maserati |
| Third Driver: | Johnny Claes |
| Third Country: | BEL |
| Third Team: | Talbot-Lago |
The 18th Grand Prix des Frontières was a Formula One motor race held on 5 June 1949 at the Chimay Street Circuit in Chimay, Belgium. The Grand Prix was won by Guy Mairesse in a Talbot-Lago T26C, setting fastest lap also. Lance Macklin finished second in a Maserati 6CM and Johnny Claes was third in another T26C.[1] [2]
| Pos | No | Driver | Entrant | Car | Time/Retired |
|---|---|---|---|---|---|
| 1 | 22 |  Guy Mairesse | Ecurie France | Talbot-Lago T26C | 1:10:10.0, 138.95 kph |
| 2 | 12 | Lance Macklin | L. Macklin | Maserati 6CM | +3:37.0 |
| 3 | 4 |  Johnny Claes | Ecurie Belge | Talbot-Lago T26C | +4:38.0 |
| 4 | 14 | Pierre Meyrat | Ecurie Letitia | Talbot Spéciale | +4:38.2 |
| 5 | 37 | "Raph" | Ecurie Mundia Course | Delahaye 135 | +2 laps |
| Ret. | 16 | Charles Pozzi | Ecurie Letitia | Talbot Spéciale | 6 laps |
| Ret. | 2 | Havaux | Havaux | Bugatti Type 49B | 2 laps |
| DNS | 8 | Arthur Legat | A. Legat | Maserati 6CM | |
| DNS | 30 | Paul Demesse | A. Legat | Bugatti Type 37A | |
| DNA | 6 |  Horace Ripley | H.J. Ripley | Talbot | Driver ill |
| DNA | 18 | Alexandre Constantin | A. Constantin | Maserati 8C | |
| DNA | 20 | Pat Garland | P.A.T. Garland | Talbot-Lago T26C | |
| DNA | 24 | Louis Rosier | Ecurie Rosier | Talbot-Lago T26C | |
| DNA | 26 | Henri Louveau | Ecurie Rosier | Talbot Spéciale | |
| DNA | 29 |  Alexander Orley | A. Orley | Veritas-BMW 328 | |