Sebastopol is the southernmost suburb of Pontypool in the county borough of Torfaen, within the historic boundaries of Monmouthshire in South Wales.

Like nearby New Inn, Sebastopol does not have a central village area, but is spread out along its main thoroughfares South Street & Greenhill Road.

Its wider economy includes many second-hand car salesrooms on Station Road, "The Open Hearth" (originally the Railway Inn) and "Sebastopol Social Club" pubs.

Since 1996 local residents resisted plans of developers put forward under the Local Plan of Torfaen County Borough Council to build homes and small business premises on a large green fields area.

[2] As of 2019, there are three property developers building estates within South Sebastopol, the largest being Edlogan Wharf by Taylor Wimpey, followed by Hanbury Village by Barratt and Pastures Green by Lewis.