The meridian 4° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, the Atlantic Ocean, Europe, Africa, the Southern Ocean, and Antarctica to the South Pole.
The 4th meridian west forms a great circle with the 176th meridian east.
Starting at the North Pole and heading south to the South Pole, the 4th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Atlantic Ocean | ||
| United Kingdom | Scotland | |
| North Sea | Dornoch Firth | |
| United Kingdom | Scotland | |
| North Sea | Moray Firth | |
| United Kingdom | Scotland, passing through Motherwell, just east of Glasgow | |
| Irish Sea | ||
| United Kingdom | Wales, passing just west of Swansea | |
| Bristol Channel | ||
| United Kingdom | England, passing just east of Barnstaple and Plymouth | |
| Atlantic Ocean | English Channel | |
| France | ||
| Atlantic Ocean | Bay of Biscay | |
| Spain | ||
| Mediterranean Sea | Alboran Sea | |
| Morocco | ||
| Algeria | ||
| Mali | ||
| Burkina Faso | ||
| Côte d'Ivoire | Passing just east of Abidjan | |
| Atlantic Ocean | ||
| Southern Ocean | ||
| Antarctica | Queen Maud Land, claimed by Norway |
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