The meridian 118° 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.
118°W is the Sixth Meridian of the Dominion Land Survey in Canada.
The 118th meridian west forms a great circle with the 62nd meridian east.
Starting at the North Pole and heading south to the South Pole, the 118th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Northwest Territories — Prince Patrick Island | ||
| Crozier Channel | ||
| Northwest Territories — Eglinton Island | ||
| Kellett Strait | ||
| M'Clure Strait | ||
| Northwest Territories — Banks Island | ||
| Prince of Wales Strait | ||
| Northwest Territories — Victoria Island | ||
| Minto Inlet | ||
| Northwest Territories — Victoria Island | ||
| Amundsen Gulf | ||
| Nunavut Northwest Territories — from, passing through the Great Bear Lake Alberta — from British Columbia — from | ||
| Washington Oregon — from Nevada — from California — from, passing just east of Los Angeles (at) | ||
| Pacific Ocean | Passing just east of Santa Catalina Island, California (at) Passing just east of San Clemente Island, California (at) Passing just east of Guadalupe Island, (at) | |
| Southern Ocean | ||
| Antarctica | Unclaimed territory | |