Costanzi
Costanzi is a surname. Notable people with the surname include:
- Carlo Costanzi, Italian gem engraver
- Giovanni Costanzi, Italian gem engraver
- Giovanni [Battista Costanzi], Italian composer and cellist
- Giulio Costanzi, Italian spaceflight scientist
- Placido Costanzi, Italian painter
- Tommaso Costanzi, Italian gem engraver