The Lancia 15/20HP (Type 54, Beta) is an automobile which was produced by Lancia of Italy in 1909.
The 15/20HP replaced the earlier 12HP-Alfa and 18/24HP Dialfa models. Basically the car was a modernized version of the 12HP with the engine displacement enlarged from 2.5 to 3.1 litres (from 28 hp to 34 hp) and the wheelbase increased from to . 150 examples were manufactured before it was replaced by the Gamma-20HP model (type 55) in 1910.