Carlo Abarth (15 November 1908 – 24 October 1979), born Karl Albert Abarth, was an automobile designer. Abarth was born in Austria, but later was naturalized as an Italian citizen; and at this time his first name Karl was changed to its Italian equivalent of Carlo.
Abarth was born in Vienna, during the time of the Austro-Hungarian Empire. As a teenager, he worked for Castagna in Italy (1925–27), designing motorbike and bicycle chassis. Back in Austria, he worked for Motor Thun and Joseph Opawsky (1927–34), and raced motorbikes, winning his first race on a James Cycle in Salzburg on 29 July 1928. He would be European champion five times, along with continuing his engineering. After a serious accident in Linz he abandoned motorbike racing, and designed a sidecar (1933) with which he managed to beat the Orient Express railway on the 1,300-kilometre (810 mi) stretch from Vienna to Ostend (1934).
He moved permanently to Italy in 1934, where he met Ferdinand Porsche's son-in-law Anton Piëch, and married his secretary. In 1938 Abarth was long hospitalized and had his racing career end, due to a racing accident in Ljubljana, Yugoslavia. He remained in that country (with some visits in Austria and Italy) until the war was over.
Following this, he moved to Merano, where his ancestors originated from. Abarth got to know both Tazio Nuvolari and the family-friend Ferry Porsche, and, together with engineer Rudolf Hruska and Piero Dusio, he established the Compagnia Industriale Sportiva Italia (CIS Italia, later becoming Cisitalia), having the Italian Porsche Konstruktionen agency (1943–48). The first automobile outcome of this cooperation was the rather unsuccessful Tipo 360 F1 prototype (see also Porsche 360). The CIS Italia project ended when Dusio moved to Argentina (1949).