| Riotuerto | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain |
| Pushpin Map Caption: | Location in Spain |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Cantabria |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Trasmiera |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | Medio Cudeyo |
| Seat Type: | Capital |
| Seat: | La Cavada |
| Coordinates: | 43.3533°N -3.7047°W |
| Elevation M: | 70 |
| Area Total Km2: | 30.48 |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Blank Info Sec1: | Spanish |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 39720 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | Ángel Cuadrado Carrera (2011) |
| Leader Party: | PP |
Riotuerto (Rutuertu in Cantabrian) is one of the municipalities of Cantabria, lying between the North Coast of the Cantábrican Sea and the mountains of the Cantabrian Sierra. It is part of the ancient merindad (shire) of Trasmiera. The centre of Riotuerto is La Cavada, once the home of the famed Royal Artillery Factory and now the site of the Town Hall, library and cannon museum. Other barrios include Barrio de Arriba, Lombana, Monte and Angustina.