| Lancia Dialfa | |
| Aka: | Lancia Dialfa-18HP |
| Manufacturer: | Lancia |
| Body Style: | 4-door cabriolet |
| Layout: | FR layout |
| Engine: | 3815 cc straight-6 40 hp |
| Production: | 1908 |
| Successor: | Lancia Beta |
| Wheelbase: | 3241NaN1 |
| Transmission: | 4-speed manual |
| Weight: | 7500NaN0 |
The Lancia 18/24 HP Dialfa was the second model built by Lancia, produced in 1908. The car was based on the four cylinder Lancia Alfa, now with a straight-6 engine. With 40 hp, it could achieve a top speed of 110km/h. Only 23 examples were built, all in 1908.