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 | ||
| Scotland | ||
| North Sea | Dornoch Firth | |
| Scotland | ||
| North Sea | Moray Firth | |
| Scotland — passing through Motherwell, just east of Glasgow (at) | ||
| Irish Sea | ||
| Wales — passing just west of Swansea (at) | ||
| Bristol Channel | ||
| England — passing just east of Plymouth (at) | ||
| Atlantic Ocean | English Channel | |
| Atlantic Ocean | Bay of Biscay | |
| Mediterranean Sea | Alboran Sea | |
| Passing just east of Abidjan (at) | ||
| Atlantic Ocean | ||
| Southern Ocean | ||
| Antarctica | Queen Maud Land — claimed by | |