The meridian 49° 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 49th meridian west forms a great circle with the 131st meridian east.
Starting at the North Pole and heading south to the South Pole, the 49th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Lincoln Sea | ||
| Wulff Land | ||
| Atlantic Ocean | ||
| Pará — Marajó island and the mainland Tocantins — from Goiás — from Minas Gerais — from São Paulo — from Paraná — from Santa Catarina — from | ||
| Atlantic Ocean | ||
| Southern Ocean | ||
| Antarctica | Claimed by both (Argentine Antarctica) and (British Antarctic Territory) | |