Piazzi is an Italian surname, may refer to:
- Giuseppe Piazzi was an Italian Theatine monk, mathematician, and astronomer.
 - Giuseppe Piazzi (Bishop), Italian prelate of 20th Century.
 - Fladimir Rufino Piazzi Júnior, (born 1978) Brazilian footballer
 
Piazzi may also refer to:
- Charles Piazzi Smyth (1819-1900), English astronomer
 - Piazzi (crater), a 2.3 km-deep lunar crater
 
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