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.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 118th meridian west passes through: ! scope="col" width="130" | Co-ordinates ! scope="col" | Country, territory or sea ! scope="col" | Notes ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Crozier Channel ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Kellett Strait ! scope="row" style="background:#b0e0e6;" | M'Clure Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Prince of Wales Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Minto Inlet ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Amundsen Gulf ! scope="row" | 🇨🇦 ! scope="row" | 🇺🇸 ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica