| Fiat 521 | |
| Manufacturer: | Fiat |
| Production: | 1928–1931 |
| Layout: | FR layout |
| Body Style: | 2-door coupe 4-door sedan 4-door limousine 4-door cabriolet |
| Engine: | straight-6 2516 cc 50 hp |
| Transmission: | 4-speed manual |
| Weight: | 1350kg (2,980lb)-1450kg (3,200lb) |
| Wheelbase: | 3141NaN1 2901NaN1 (521 C) |
| Predecessor: | Fiat 520 |
| Successor: | Fiat 522 |
The Fiat 521 is a passenger car produced by Fiat between 1928 and 1931. The 521 was derived from its predecessor model, the Fiat 520, but with a bigger engine and chassis. The 521C was a shorter variant. This car was produced outside Italy, most notably at the Fiat-NSU plant in Heilbronn, starting in 1930, setting Fiat on the path to its subsequent multinational status.
More than 33,000 Fiat 521s were produced in Italy and Germany.