The meridian 40° 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.
Starting at the North Pole and heading south to the South Pole, the 40th meridian west passes through:
| Country, territory or sea | Notes |
|---|---|
| Arctic Ocean | |
| Atlantic Ocean | |
| Atlantic Ocean | |
| Southern Ocean | |
| South Orkney Islands | Powell Island. Claimed by both |
| Southern Ocean | |
| Antarctica | Territory claimed by both |
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