| Fiat 503 | |
| Manufacturer: | Fiat |
| Production: | 1926–1927 |
| Class: | Small family car (C) |
| Layout: | FR layout |
| Body Style: | 4-door sedan 4-door cabriolet |
| Engine: | 1460 cc I4 |
| Transmission: | 4-speed manual |
| Weight: | 11000NaN0 |
| Wheelbase: | 2751NaN1 |
| Predecessor: | Fiat 501 |
The Fiat 503 is a car produced by Fiat between 1926 and 1927. The 503 was based on the Fiat 501, with modified suspension and brakes. It used the 501's 1.5-liter engine, producing . The company produced 42,000 examples of the 503.