The meridian 55° 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 55th meridian west forms a great circle with the 125th meridian east.
Starting at the North Pole and heading south to the South Pole, the 55th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Lincoln Sea | ||
| Nyeboe Land | ||
| Baffin Bay | ||
| Qeqertarsuatsiaq Island | ||
| Baffin Bay | ||
| Davis Strait | Passing just west of Disko Island, (at) | |
| Atlantic Ocean | Labrador Sea An unnamed part of the Ocean Notre Dame Bay | |
| Newfoundland and Labrador — the Exploits Islands and the island of Newfoundland | ||
| Fortune Bay | ||
| Newfoundland and Labrador — Burin Peninsula on the island of Newfoundland | ||
| Atlantic Ocean | ||
| Passing just east of Paramaribo | ||
| Pará Mato Grosso — from Mato Grosso do Sul — from | ||
| Rio Grande do Sul | ||
| Atlantic Ocean | ||
| Southern Ocean | ||
| South Shetland Islands | Elephant Island — claimed by, and | |
| Southern Ocean | Passing just east of Joinville Island, Antarctica (at) | |
| Antarctica | Territory claimed by, and | |