The Siata 300BC Barchetta Sport Spider was a car manufactured between 1951 and 1954.

The ravishingly beautiful racing body was designed by Mario Revelli de Beaumont and built by Nuccio Bertone.

The cars were fitted with a 750cc or 1000cc Crosley engine. Some were fitted with 1100cc Fiat engines.

Only about 40 cars were produced, of which approximately 25 are known to have survived.