| Costa Oriental | |
| Native Name: | Costa Esmeralda |
| Native Name Lang: | es |
| Settlement Type: | Comarca |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Cantabria |
| Subdivision Type2: | Province |
| Subdivision Name2: | Cantabria |
| Seat Type: | Capital |
| Seat: | Laredo |
| Parts Type: | Municipalities |
| Parts Style: | list |
| P1: | Castro Urdiales, Colindres, Laredo, Liendo |
| Area Total Km2: | 144.26 |
| Population Footnotes: | [1] |
| Population Total: | 52772 |
| Population As Of: | 2018 |
| Population Density Km2: | auto |
| Blank Name Sec1: | Largest municipality |
| Blank Info Sec1: | Castro Urdiales |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postal code |
| Area Code Type: | Dialing code |
The Eastern Coast of Cantabria is a comarca (shire, but with no administrative role) in the autonomous community of Cantabria, northern Spain, that comprises the municipalities of Colindres, Laredo, Liendo and Castro Urdiales.
There are 4 municipalities comprising the comarca, listed below with their areas and populations:
| Name | Area (km2) | Population (2001)[2] | Population (2011)[3] | Population (2018)[4] | |
|---|---|---|---|---|---|
| Castro Urdiales | 96.7 | 21,081 | 32,487 | 31,977 | |
| Colindres | 5.9 | 6,924 | 8,109 | 8,453 | |
| Laredo | 15.7 | 12,559 | 12,088 | 11,148 | |
| Liendo | 26.0 | 889 | 1,284 | 1,194 |
thumb|left|Castro Urdiales