| Mariehamn sub-region | |
| Settlement Type: | Sub-region |
| Native Name: | Mariehamns stad |
| Subdivision Type: | Country |
| Subdivision Name: |  Finland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Åland |
| Seat Type: | Capital |
| Population Total: | 11209 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Timezone1: | EET |
| Utc Offset1: | +2 |
| Timezone1 Dst: | EEST |
| Utc Offset1 Dst: | +3 |
Mariehamn sub-region is a subdivision of Åland and one of the Sub-regions of Finland since 2009.