| Audna | |
| Name Other: | Audnedalselva |
| Pushpin Map: | Agder#Norway |
| Pushpin Map Caption: | Location of the river |
| Subdivision Type1: | Country |
| Subdivision Name1: | Norway |
| Subdivision Type2: | County |
| Subdivision Name2: | Agder |
| Subdivision Type3: | Municipalities |
| Subdivision Name3: | Lindesnes, Lyngdal |
| Length: | 55km (34miles) |
| Discharge1 Avg: | 20m3/s |
| Discharge1 Max: | 183m3/s |
| Source1: | Grindheimsvatnet lake |
| Source1 Location: | Lyngdal, Norway |
| Source1 Coordinates: | 58.4472°N 7.4239°W |
| Source1 Elevation: | 117m (384feet) |
| Mouth: | Snigsfjorden |
| Mouth Location: | Lindesnes, Norway |
| Mouth Coordinates: | 58.055°N 7.2772°W |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 438km2 |
Audna or Audnedalselva is a river in Agder county, Norway. The 55km (34miles) long river runs from the lake Grindheimsvatnet, just north of the village of Byremo in Lyngdal municipality, south through the Audnedalen valley to its mouth at the Snigsfjorden in Lindesnes municipality. The mouth is located about southwest of the village of Vigeland. The river has a drainage basin that covers . The river runs through two lakes: Øvre Øydnavatnet and Ytre Øydnavatnet.[1] The river is regulated for hydroelectric power with a total of eight power plants along the river and its tributaries. Together, the river produces an average annual production (2015) of 48.5GWh of electricity.