| Oliver's Crossroads | community in central Jones County. |
| Olivers | community in central Jones County. |
| Olivers Crossroads | community in S Catawba County. |
| Olivet | community in NW Caldwell County on Mulberry Creek. Named for Olivet Methodist Church, in turn named for biblical Mount Olivet or Mount of Olives. |
| Olivette | community in central Buncombe County. |
| Olivia | community in W Harnett County. Settled about 1865. Known as Rock Branch until 1913, when it was renamed to honor W. J. Olive, who in 1912 introduced cultivation of flue-cured tobacco there. |
| Ollie Branch | rises in central Graham County and flows SW into East Buffalo Creek. |
| Olmmetta | community in E Wilkes County. |
| Olne | community in NW Warren County served by post office, 1886-1904. |
| Olympia | community in W Pamlico County. In 1891 named for Mount Olympus when a post office, discontinued in 1908, was est. there. |