| Savelli Observatory | Savelli | — |
| Serra La Nave observatory | Ragalna | 1.735 m |
| Serra Observatory | Prelo | — |
| Seveso observatory | provincia de Monza y Brianza | — |
 Siligo astronomical observatory | Siligo | — |
| Sintini observatory | Alfonsine | — |
| Skylive observatory | Catania | — |
| Sormano 2 Observatory | Villa Melzi de Eril | — |
| Sozzago astronomical Station | Sozzago | — |
| Spica observatory | Carmignano | — |
| Stazione Astronomica Betelgeuse observatory | Magnago | — |
| Stazione Astronomica Le Pleiadi | Taverna | — |
| Stia observatory | Stia | — |
 Tavolaia astronomical observatory | Santa Maria a Monte | — |
 The Tower of the Sun | Brembate di Sopra | — |
 The Virtual Telescope Project | Ceccano | — |
| TLC Observatory | Bolonia | — |
| Torre Villa Boffi observatory | Giussano | — |
| Tortona observatory | Tortona | — |
| Turin Observatory | Turín | — |
| Turin observatory (before 1913) | Turín | — |
| Tuscolana astronomy association | Rocca di Papa | — |
| Valdicerro observatory | Loreto | — |
| Vallemare di Borbona Astronomical Observatory | Borbona | 1.170 m |
| Vallinfreda astronomical observatory | Vallinfreda | — |
| Varuna observatory | Turín | — |
| Vegaquattro Observatory | Novi Ligure | — |
 Virgo | Santo Stefano a Macerata | — |
| Virgo Oservatory | Séveso | — |
| Whitestar observatory | Tricesimo | — |
 Ximenian Observatory | Florencia | — |
 Zizzola | Bra | — |