The meridian 156° 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 156th meridian west forms a great circle with the 24th meridian east.
Starting at the North Pole and heading south to the South Pole, the 156th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| United States | Alaska | |
| Pacific Ocean | Passing just west of Chirikof Island, Alaska, United States | |
| United States | Hawaii - Maui island | |
| Pacific Ocean | ʻAlenuihāhā Channel | |
| United States | Hawaii - Hawaii island | |
| Pacific Ocean | Passing just west of Starbuck Island, Kiribati The meridian defines the western maritime boundary of the Cook Islands from to |
|
| Southern Ocean | ||
| Antarctica | Ross Dependency, claimed by New Zealand |
|
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