The meridian 135° 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 135th meridian west forms a great circle with the 45th meridian east.
The Alaska Time Zone is based on the mean solar time of this meridian.
Starting at the North Pole and heading south to the South Pole, the 135th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Beaufort Sea | ||
| Northwest Territories — Richards Island and mainland, passing through Aklavik Yukon — from (passing just east of Whitehorse at) British Columbia — from | ||
| Alaska — Alaska Panhandle (mainland) | ||
| Lynn Canal | ||
| Alaska — Lincoln Island | ||
| Lynn Canal | Passing just west of Admiralty Island, Alaska, (at) | |
| Alaska — Chichagof Island and Baranof Island | ||
| Pacific Ocean | ||
| Island of Mangareva | ||
| Pacific Ocean | ||
| Southern Ocean | ||
| Antarctica | Unclaimed territory | |