The meridian 139° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.
The 139th meridian west forms a great circle with the 41st meridian east.
Starting at the North Pole and heading south to the South Pole, the 139th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Beaufort Sea | ||
| Canada | Yukon - Herschel Island | |
| Beaufort Sea | Mackenzie Bay | |
| Canada | Yukon British Columbia - for about 2km |
|
| United States | Alaska | |
| Pacific Ocean | Passing just west of Fatu Huku island, French Polynesia | |
| French Polynesia | Hiva Oa island | |
| Pacific Ocean | Passing between Tahuata and Mohotani islands, French Polynesia Passing just west of Puka-Puka atoll, French Polynesia Passing just east of Akiaki atoll, French Polynesia Passing just west of Vahitahi atoll, French Polynesia Passing between Vairaatea atoll and Nukutavake island, French Polynesia Passing just east of Vanavana atoll, French Polynesia |
|
| French Polynesia | Moruroa atoll | |
| Pacific Ocean | Passing just west of Fangataufa atoll, French Polynesia | |
| Southern Ocean | ||
| Antarctica | Unclaimed territory |
|
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