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 | ||
| Alaska | ||
| Pacific Ocean | Passing just west of Chirikof Island, Alaska, (at) | |
| Hawaii — Maui island | ||
| Pacific Ocean | ʻAlenuihāhā Channel | |
| Hawaii — Hawaii island | ||
| Pacific Ocean | Passing just west of Starbuck Island, (at) The meridian defines the eastern maritime boundary of the from to | |
| Southern Ocean | ||
| Antarctica | Ross Dependency, claimed by | |