The meridian 39° 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 39th meridian west forms a great circle with the 141st meridian east.
Starting at the North Pole and heading south to the South Pole, the 39th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Lincoln Sea | ||
| Atlantic Ocean | ||
| Ceará Pernambuco — from Bahia — from | ||
| Atlantic Ocean | Passing close to the coast of, just east of Ilhéus | |
| Bahia | ||
| Atlantic Ocean | ||
| Southern Ocean | ||
| Antarctica | Claimed by both (Argentine Antarctica) and (British Antarctic Territory) | |