Pietro Chiarini was an Italian composer.
From 1738 to 1744, he was in Venice where four of his operas and an oratorio were performed. Later he went to Cremona, where in 1754 he wrote and presented the intermezzo La donna dottor. He was later appointed maestro di cappella at the court of Cremona in 1756. It is speculated that Giovanni Battista Pergolesi's opera Il geloso schernito may in fact have been composed by Chiarini and not Pergolesi.