| Okok | See Ocracoke. |
| Ola | former community in W Haywood County near lat. 35°36'15" N., long. 83°08'00". The site is now within Great Smoky Mountains National Park and abandoned. |
| Old Apalachia | former community in NW Cherokee County below and N of Apalachia Dam near the junction of Shuler Creek with Hiwassee River. |
| Old Bald Creek | rises in S Haywood County and flows NE into Allen Creek. |
| Old Bald Mountain | on Haywood-Jackson county line. Alt. 5,800. Named for bald appearance from the Jackson County side. |
| Old Bald Ridge | extends from Chastine Creek in E central Jackson County N and NE to Allen Creek in SW Haywood County. Named for Old Bald Mountain, one of its peaks. |
| Old Barfields | See Tuscarora Beach. |
| Old Bear, The | point of land off E Pamlico County extending into Jones Bay. |
| Old Bethlehem | community in SE Warren County near the Halifax-Warren county line. |
| Old Billy Top | on the Cherokee-Graham county line in the Snowbird Mountains. |