Giulio Castelli has been a Napoli's Italian defender. In 5 seasons he played 121 matches scoring 7 goals.
| Season | Year | | Caps | Goals | | Caps | Goals | | Caps | Goals | | Caps | Goals | It L | It C | Eu C | |
|---|
| 1951-52 | 51-52 |
| 30 | 0 | A | 30 | 0 | - | 0 | 0 | - | 0 | 0 | 30 (0) | 0 (0) | 0 (0) | |
| 1952-53 | 52-53 |
| 27 | 2 | A | 27 | 2 | - | 0 | 0 | - | 0 | 0 | 27 (2) | 0 (0) | 0 (0) | |
| 1953-54 | 53-54 |
| 24 | 1 | A | 24 | 1 | - | 0 | 0 | - | 0 | 0 | 24 (1) | 0 (0) | 0 (0) | |
| 1954-55 | 54-55 |
| 20 | 1 | A | 20 | 1 | - | 0 | 0 | - | 0 | 0 | 20 (1) | 0 (0) | 0 (0) | |
| 1955-56 | 55-56 |
| 20 | 3 | A | 20 | 3 | - | 0 | 0 | - | 0 | 0 | 20 (3) | 0 (0) | 0 (0) | |
| |
| 121 | 7 | | 121 | 7 | | 0 | 0 | | 0 | 0 | 121 (7) | 0 (0) | 0 (0) | |
- Goalkeeper with most appearances in Italian Cup and Supercup