| Breidvatn | |
| Location: | Bykle, Agder, Norway |
| Coordinates: | 59.6306°N 7.4375°W |
Breidvatn is a lake in Bykle municipality in Setesdal, in Agder County, southern Norway.[1] It has an outlet to the south to the river Otra. The main inlets are Bjålaupet, which enters from Sæsvatn in the north, and Kaldsåi from the west. Together with Sæsvatn, Breivatn is regulated as a reservoir for the power plants further down the Otravassdraget.