| Country: | ISL |
| Type: | Track |
| Route: | 26 |
| Map: | Iceland Route F26.png |
| Length Km: | 154.5 |
| Length Ref: | http://www.vegagerdin.is/vegakerfid/vegalengdir/ |
| Direction A: | Northern |
| Terminus A: | Bárðardalsvegur vestri |
| Junction: | Austurleið Skagafjarðarleið Dragaleið |
| Direction B: | Southern |
| Terminus B: | Landvegur |
Route F26 or Sprengisandsleið (in Icelandic pronounced as /ˈspreiɲcɪˌsan(t)sˌleiːθ/) is a highland gravel road in Iceland, running through the Sprengisandur area between the glaciers Hofsjökull and Vatnajökull.
With its 200 km, it is the longest of the Icelandic highland roads. Its southern end is at the lake Þórisvatn, to the northeast of the volcano Hekla, and its northern end is the south part of Bárðardalur valley, to the southwest of lake Mývatn.