| Type: | GP |
| Country: | Argentina |
| Grand Prix: | Buenos Aires |
| Date: | December 18 |
| Year: | 1949 |
| Official Name: | IV Gran Premio del General Juan Perón y de la Ciudad de Buenos Aires |
| Location: | Parco Palermo Buenos Aires |
| Course: | Public roads |
| Course Mi: | 3.022 |
| Course Km: | 4.865 |
| Distance Laps: | 35 |
| Distance Mi: | 105.80 |
| Distance Km: | 170.27 |
| Pole Driver: | Luigi Villoresi |
| Pole Team: | Maserati 4CL |
| Pole Time: | N/A |
| Pole Country: | Italy |
| Fast Driver: | Juan Manuel Fangio |
| Fast Team: | Ferrari 166 FL |
| Fast Time: | 2m 29.2 (117.39 km/h) |
| Fast Country: | Argentina |
| First Driver: | Alberto Ascari |
| First Team: | Ferrari 166 FL |
| First Country: | Italy |
| Second Driver: | Juan Manuel Fangio |
| Second Team: | Ferrari 166 FL |
| Second Country: | Argentina |
| Third Driver: | Luigi Villoresi |
| Third Team: | Ferrari 166 FL |
| Third Country: | Italy |
The third of three 1949 Buenos Aires Grand Prix (official name: IV Gran Premio del General Juan Perón y de la Ciudad de Buenos Aires), was a Grand Prix motor race held at the Palermo street circuit in Buenos Aires on December 18, 1949. [1]
| Pos | Driver | Constructor | Laps | Time/Retired | |
|---|---|---|---|---|---|
| 1 |  Alberto Ascari | Ferrari 166 FL | 35 | 1:29:00.2 | |
| 2 |  Juan Manuel Fangio | Ferrari 166 FL | 35 | 1:29:29.4 | |
| 3 | Luigi Villoresi | Ferrari 166 FL | 35 | 1:30:38. | |
| 4 | Benedicto Campos | Ferrari 166 FL | 34 | N/A | |
| 5 | Froilán González | 34 | N/A | ||
| 6 |  P. Bira | Maserati 4CLT | 34 | N/A | |
| 7 |  Emmanuel de Graffenried | Maserati 4CLT | 33 | N/A | |
| 8 | Dorino Serafini | Ferrari 125C F1 | 33 | N/A | |
| 9 | Clemente Biondetti | Maserati 4CLT | 33 | N/A | |
| 10 | Peter Whitehead | Ferrari 125C F1 | 32 | N/A | |
| 11 |  Louis Chiron | Maserati 4CLT | 32 | N/A | |
| Ret |  Philippe Étancelin | Maserati 4CLT | 32 | Oil pressure | |
| Ret |  Eitel Cantoni | Maserati 4CM | 32 | ||
| Ret | Piero Taruffi | Maserati 4CLT | 20 | ||
| Ret | Nino Farina | Maserati 4CLT | 16 | N/A | |
| Ret | Louis Rosier | Talbot T26 | 14 | ||
| Ret | Piero Carini | Maserati 4CLT | 11 | ||
| Ret | Pascual Puopolo | Maserati 4CLT | 9 | ||
| Ret | Reg Parnell | Maserati 4CLT | 6 | ||
| Ret | Clemar Bucci | Alfa Romeo 12C | 5 | ||
| Ret | Felice Bonetto | Maserati 4CLT | 4 | ||
| DNS | Óscar Alfredo Gálvez | Alfa Romeo 308 | |||
| DNS |  Manfred von Brauchitsch | Maserati 8CL |