| Lamasón | |
| 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: | Saja-Nansa |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | San Vicente de la Barquera |
| Seat Type: | Capital |
| Seat: | Sobrelapeña |
| Coordinates: | 43.2536°N -4.4819°W |
| Elevation M: | 240 |
| Area Total Km2: | 71.23 |
| Population Demonym: | masoniegu/masoniego |
| 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 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | Venancio Fernández Alonso (2007) |
| Leader Party: | PRC |
Lamasón is a municipality located in the autonomous community of Cantabria, Spain. According to the 2007 census, the city has a population of 338 inhabitants. Its capital is Sobrelapeña.