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
This disambiguation page lists articles associated with the title Piazzi.
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