The meridian 68° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Atlantic Ocean, the Caribbean Sea, South America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole. The 68th meridian west forms a great circle with the 112th meridian east.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 68th meridian west passes through: ! scope="col" width="120" | Co-ordinates ! scope="col" | Country, territory or sea ! scope="col" | Notes ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" style="background:#b0e0e6;" | Lincoln Sea ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Nares Strait ! scope="row" | 🇬🇱 ! scope="row" style="background:#b0e0e6;" | Baffin Bay ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Hudson Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Ungava Bay ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Saint Lawrence River ! scope="row" | 🇨🇦 ! scope="row" | 🇺🇸 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" style="background:#b0e0e6;" | Caribbean Sea ! scope="row" | 🇻🇪 ! scope="row" | 🇨🇴 ! scope="row" | 🇧🇷 ! scope="row" | 🇧🇴 ! scope="row" | ! scope="row" | 🇦🇷 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇦🇷 ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica