Flisa is a river in Innlandet county, Norway. The 55-kilometre (34 mi) long river is a tributary of the large river Glomma. The river flows through the municipalities of Åsnes and Våler. The river Flisa starts at the confluence of the rivers Ulvåa and Holåa on the border of Våler and Åsnes. It then flows to the south and west before joining the river Glomma just south of the village of Flisa. Some of the side rivers that join the Flisa are Vermundelv and Kynna.