Pietro Sante Arcari III (2 December 1909 – 8 February 1988) was an Italian footballer and forward, or as a right winger.

A prolific goalscorer, known for his speed and ability in the air, he played 256 matches in Serie A, scoring 80 goals.

[2][3] While Pietro's most notable success came at Milan, an unusual incident occurred while playing for Genoa in 1937.

During a Fiorentina-Genoa match won 2–1 by Genoa in Florence the linesman called a nonexistent offsides on Arcari; the referee Caironi, without hesitation sent his colleague to the locker room, who was quickly replaced.

This biographical article related to association football in Italy, about a midfielder born from 1900 to 1909, is a stub.