The meridian 50° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Greenland, the Atlantic Ocean, South America, the Southern Ocean, and Antarctica to the South Pole.
The 50th meridian west forms a great circle with the 130th meridian east.
Starting at the North Pole and heading south to the South Pole, the 50th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Lincoln Sea | ||
| Beaumont Island | ||
| Lincoln Sea | ||
| Wulff Land | ||
| Sherard Osborn Fjord | ||
| Atlantic Ocean | ||
| Amapá — mainland and the island of Bailique | ||
| Atlantic Ocean | Mouth of the Amazon River | |
| Pará — islands of Caviana and Marajó, and the mainland Tocantins — from Goiás — from Minas Gerais — from São Paulo — from Paraná — from Santa Catarina — from Rio Grande do Sul — from Santa Catarina — for about 11 km from Rio Grande do Sul — from | ||
| Atlantic Ocean | ||
| Southern Ocean | ||
| Antarctica | Claimed by both (Argentine Antarctica) and (British Antarctic Territory) | |