| Arenas de Iguña | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Cantabria#Spain |
| Pushpin Map Caption: | Location within Cantabria |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Besaya valley |
| Subdivision Type4: | Judicial district |
| Coordinates: | 43.1881°N -4.0483°W |
| Elevation M: | 177 |
| Area Total Km2: | 86.82 |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 39450 |
| Area Code Type: | Dialing code |
| Leader Title: | Mayor |
| Leader Name: | Ramón Morais Vallés (2007) |
| Leader Party: | PP |
Arenas de Iguña is a municipality located in the autonomous community of Cantabria, Spain. According to the 2007 census, the city has a population of 1,927 inhabitants.