Torridal is a V-shaped valley in Agder county, Norway. The valley passes through portions of the municipalities of Kristiansand and Vennesla in an area that was historically a part of the former Oddernes municipality. Today it includes areas north of the city center of Kristiansand on both riverbanks of the river Otra. The local name Torridalselva (meaning Torridal river) is commonly used for the river's lower course from Mosby to the sea. Norwegian National Road 9 (Setesdalsveien) and the Sørlandet Line both run along the west side of the river Otra, through the Torridal valley.