The meridian 58° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Atlantic Ocean, South America, the Southern Ocean, and Antarctica to the South Pole.
The 58th meridian west forms a great circle with the 122nd meridian east.
Starting at the North Pole and heading south to the South Pole, the 58th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Lincoln Sea | ||
| Nyeboe Land | ||
| Baffin Bay | ||
| Davis Strait | ||
| Atlantic Ocean | Labrador Sea | |
| Newfoundland and Labrador — Labrador Quebec — from | ||
| Gulf of Saint Lawrence | ||
| Newfoundland and Labrador — island of Newfoundland | ||
| Atlantic Ocean | ||
| Passing just east of Georgetown | ||
| Passing through area claimed by | ||
| Pará Amazonas — from Pará — from Mato Grosso — from | ||
| Mato Grosso do Sul | ||
| For about 20 km | ||
| Mato Grosso do Sul | ||
| For about 15 km | ||
| For about 10 km | ||
| Río de la Plata | ||
| Passing just west of La Plata, Argentina | ||
| Atlantic Ocean | ||
| Island of East Falkland — claimed by | ||
| Atlantic Ocean | ||
| Southern Ocean | ||
| South Shetland Islands | King George Island — claimed by, and | |
| Southern Ocean | ||
| Antarctica | Antarctic Peninsula — claimed by, and | |
| Southern Ocean | Weddell Sea | |
| Antarctica | James Ross Island — claimed by, and | |
| Southern Ocean | Weddell Sea | |
| Antarctica | Territory claimed by, and | |