| Official Name: | Fasnia |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Province of Santa Cruz de Tenerife#Canary Islands#Spain with Canary Islands |
| Pushpin Map Caption: | Location in the province of Santa Cruz de Tenerife |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous Region |
| Subdivision Name1: | Canary Islands |
| Subdivision Type2: | Province |
| Subdivision Name2: | Santa Cruz de Tenerife |
| Subdivision Type3: | Island |
| Subdivision Name3: | Tenerife |
| Leader Title: | Mayor |
| Area Total Km2: | 45.11 |
| Population Density Km2: | auto |
| Timezone: | GMT |
| Utc Offset: | +0 |
| Coordinates: | 28.2333°N -42°W |
| Postal Code Type: | Post Code |
| Postal Code: | 38570 |
| Blank Name: | Climate |
| Blank Info: | Csa |
Fasnia is a town and a municipality in the eastern part of the Spanish island of Tenerife, one of the Canary Islands, and part of the province of Santa Cruz de Tenerife. The municipality extends for 45.1km2 from the mountainous interior to the beaches on the Atlantic. Its population is 2,873 (2013). The TF-1 motorway passes through the municipality.
The name of the municipality comes from that of its administrative capital, being a term of Guanche origin that also appears in the historical documentation with the Fasnea variant.[1]
As for its possible meaning, the historian Dominik Josef Wölfel relates it to the Berber word tafessena / tifesseniwin, 'step, rung of a ladder', an opinion that is also accepted by the philologist and historian Ignacio Reyes.