Pietro Ghersi was an Italian motorcycle racer and, from 1927, also a racecar driver. He was born in Genoa. With his brother Mario Ghersi and Luigi Arcangeli he biked in the 1926 Isle of Man TT and 1930 Isle of Man TT in Moto Guzzi.
In 1933, with himself as the only driver, he formed the Pietro Ghersi Racing Team based in Genova, using a 2.3-liter Bugatti Type 35, a 1.1-liter Maserati monoposto, and a 2.3-liter Alfa Romeo. He raced for Scuderia Ferrari in 1934, and privately in a Maserati 8CM in 1935 1936. He continued until the 1938 season.