Stjørdalselva (lit. 'Stjørdal River') is a 70-kilometre (43 mi) long river that reaches from near the Norwegian–Swedish border down the Stjørdalen valley through Meråker Municipality and Stjørdal Municipality before entering the Trondheimsfjord. The mouth is located on the south side of the town Stjørdalshalsen, just south of Trondheim Airport, Værnes. The village of Hell lies on the south side of the river's mouth. The mouth of the river was moved to allow the runway to expand into the delta.

The European route E14 highway and the Meråker Line railway follow the river from its source the entire length of the river.