Pietri or Piétri is a surname. Notable people with the surname include:

• Alicia Pietri Montemayor (1923–2011), wife of Venezuelan president Rafael Caldera
• Annie Pietri (born 1956), French writer.
• Arturo Uslar Pietri, Venezuelan intellectual, lawyer, journalist, writer, television producer and politician
• A.S.D. Boca Pietri, Italian association football club from Bologna,
• Dorando Pietri, Italian athlete
• Eugenio de Bellard Pietri, noted speleologist
• François Piétri, French politician of the 20th century
• Frank Pietri, American Jazz Instructor, choreographer and performer
• Giuseppe Pietri (1886–1946), Italian composer
• Joseph Marie Piétri (1820–1902), French lawyer, public servant, police chief of Paris and senator
• Julie Pietri (born 1955), French pop singer
• Pedro Pietri, Nuyorican poet and playwright
• Pietro da Pietri, Italian painter of the late-Baroque period
• Rafael Pietri Oms, University of Puerto Rico chancellor
• Rick Pietri, head women's basketball coach at the University of South Alabama
• Robertino Pietri (born 1985), Grand Prix motorcycle racer from Venezuela