The Lancia Gamma (Tipo 55, then renamed to Gamma) is a passenger car produced by Italian car manufacturer Lancia in 1910. Derived from previous Beta model, now equipped with bigger engine. The engine was straight-4 with bore of 100 mm (3.9 in) and stroke 110 mm (4.3 in), totaling engine capacity of 3455.75 cc. The engine produced 40 hp at 1500 rpm, giving top speed around 110 kilometres per hour (68 mph).
This HP-20 type 55 was built 258 units in 1910 and replaced with Lancia Delta-20/30HP in 1911.