| Sax | |
| Settlement Type: | Municipality |
| Shield Link: | Coat of arms of Sax |
| Pushpin Map: | Spain Province of Alicante#Spain Valencia#Spain |
| Pushpin Map Caption: | Location in Spain |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Alicante |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Alt Vinalopó |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | Villena |
| Coordinates: | 38.5394°N -0.8161°W |
| Elevation M: | 472 |
| Area Total Km2: | 63.5 |
| Population Demonym: | Sajeño |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Blank Info Sec1: | Spanish |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 03630 |
| Area Code Type: | Dialing code |
| Leader Title: | Mayor |
| Leader Name: | Laura Estevan Antolín |
| Leader Party: | PP |
Sax (pronounced as /es/, locally: pronounced as /es/. ca|'''Saix''' pronounced as /ca/) is a municipality in the comarca of Alt Vinalopó, province of Alicante, Valencian Community.
The origin of the name Sax is uncertain, although it has been related to the Latin term saxum (rock), due to the pointed rocky mass on which its castle stands, and around which the town appeared. The term has also been related to the Segisa that Ptolemy located in Bastetania. It is possible that during the Roman period there was an establishment or inn in Sax next to the Via Augusta. The current pronunciation is /saks/ although traditionally it was /sax/, as confirmed by the gentilic name Sajeño.
There are archaeological findings in the area dating to the Bronze Age, as well as an Iberian necropolis and remains of Roman villas.
In the later stages of the Reconquista, Sax was at the focus of tensions between Castile and Aragon, since James I of Aragon conquered it from the Moors though it should have been reserved to Castile under the treaties of Tudilén and Cazorla.