| Portnashangan | |
| Settlement Type: | Townland |
| Pushpin Map: | Ireland |
| Pushpin Map Caption: | Location of Portnashangan within County Westmeath in the Republic of Ireland |
| Coordinates: | 53.5836°N -7.3736°W |
| Subdivision Type: | Country |
| Subdivision Name: | Ireland |
| Subdivision Type1: | Province |
| Subdivision Name1: | Leinster |
| Subdivision Type2: | County |
| Subdivision Name2: | County Westmeath |
| Blank Name: | Irish grid reference |
| Blank Info: | N415594 |
Portnashangan [1] is a townland in County Westmeath, Ireland. It is located about 6.81km (04.23miles) north–north–west of Mullingar.
Portnashangan is one of 8 townlands of the civil parish of Portnashangan in the barony of Corkaree in the Province of Leinster. The townland covers 498acres. About half of the eastern boundary of the townland includes a strip of Scragh Bog approximately 50m wide.
The neighbouring townlands are: Ballynafid, Knightswood and Rathlevanagh to the north, Loughanstown to the east and Ballynagall, County Westmeath|]] and Culleen More to the south.[2] [3]
In the 1911 census of Ireland there were 17 houses[4] and 67 inhabitants[5] in the townland.