| Casalarreina | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain La Rioja |
| Pushpin Map Caption: | Location of Casalarreina within La Rioja |
| Subdivision Type: | Comarca |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Comarca |
| Subdivision Name2: | Haro |
| Coordinates: | 42.5475°N -2.9125°W |
| Elevation M: | 500 |
| Area Total Km2: | 8.13 |
| Established Title: | Founded |
| Population Demonym: | casalarreitero, ra |
| 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: | 26230 |
| Area Code Type: | Dialing code |
| Leader Title: | Mayor |
| Leader Name: | Félix Caperos Elosúa |
| Leader Party: | PSOE |
Casalarreina is a town located in the province of La Rioja, Spain. It is located 47km (29miles) from Logroño, the capital of La Rioja, in the north-west.
The first documents about the village were around 1170 by Aldonza Ruiz de Castro.
The town borders the Basque-Aragonese freeway. In 2011, there were 1,355 inhabitants.INE