Breiðdalsvík (Icelandic pronunciation: [ˈpreiðˌtalsˌviːk]) is a fishing town in Iceland, located on a large cove of the same name.

It is part of the municipality of Fjarðabyggð in the Eastern Region, and is at the mouth of Breiðdalur [is], the valley of the river Breiðdalsá.

Route 95 branches off Route 1 near Breiðdalsvík and runs through the valley and over Breiðdalsheiði [is], a heath formed by an eroded volcano, to Egilsstaðir.

The former general store, the oldest building in the town, is now a geological centre with exhibits devoted to the volcanologist George Walker and to the linguist and literary historian Stefán Einarsson, who was born in Breiðdalur.

[2] On 10 September 1942, Breiðdalsvík was the location of one of the few World War II air raids in Iceland: a German warplane strafed a residential building called Hamar, hitting it with 9 bullets.