Allegretti is a surname of Italian origin. Notable people with the surname include:
- Antonio Allegretti (1840 –1918), Italian sculptor
- Carlo Allegretti (16th-17th century), Italian painter
- Joel Allegretti, American poet and fiction writer
- Mario Allegretti
- Nick Allegretti (born 1996), American football player
- Riccardo Allegretti (born 1978), former Italian footballer
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