Stjørdalen is a valley and a traditional district in Trøndelag county, Norway.

The valley follows the Stjørdalselva river from the Norway-Sweden border 75 kilometres (47 mi) to the west where it empties into the Trondheimsfjorden.

The European route E14 highway and the Meråker Line railway follow the river through the length of the valley.

[2] On 1 January 1838, the whole valley-district was established as Stjørdalen Municipality under the newly passed formannskapsdistrikt.

[3] On 1 June 1997, the village of Stjørdalshalsen in Stjørdal Municipality gained status as a town.