The 15-20hp was one of the first offerings from the Spanish car builder Hispano-Suiza. The name reflects the small inline four-cylinder's power output, as it was meant to be a versatile passenger car, unlike its performance-oriented brother, the Alfonso XIII model. Hispano-Suiza's Omnibus, which was a public transport vehicle, was built on the 15/20 platform. It was a large 10-passenger bus that often included seating on the roof. The Hispano-Suiza 15-20hp was built until 1914.