| Subdivision 1O | |
| Official Name: | Division No. 1, Subdivision O |
| Pushpin Map: | Newfoundland |
| Leader Name1: | Helen Conway-Ottenheimer (PCPNL, Harbour Main) |
| Leader Name2: | Ken McDonald (LIB, Avalon) |
| Area Land Km2: | 78.68 |
| Population As Of: | 2016 |
| Population Total: | 663 |
| Population Density Km2: | 8.4 |
| Utc Offset: | -3:30 |
| Utc Offset Dst: | -2:30 |
Division No. 1, Subdivision O is an unorganized subdivision on the Avalon Peninsula in Newfoundland and Labrador, Canada, in Division 1. It's divided into two parts, the northern portion touches Conception Bay. It includes the unincorporated communities of Marysvale and Salmonier Line.
47.496°N -53.226°WMarysvale is a settlement in Newfoundland and Labrador.
Prior to about 1900 the community of Marysvale was known as Turk's Gut. Somewhat later the nearby community of English Cove (sometimes mistakenly called English Harbour) also became part of Marysvale.