The meridian 73° 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 73rd meridian west forms a great circle with the 107th meridian east.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 73rd 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" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Nares Strait ! scope="row" | 🇬🇱 ! scope="row" style="background:#b0e0e6;" | Baffin Bay ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Foxe Basin ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Hudson Strait ! scope="row" | 🇨🇦 ! scope="row" | 🇺🇸 ! scope="row" style="background:#b0e0e6;" | Long Island Sound ! scope="row" | 🇺🇸 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇧🇸 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇧🇸 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇭🇹 ! scope="row" style="background:#b0e0e6;" | Caribbean Sea ! scope="row" | 🇭🇹 ! scope="row" style="background:#b0e0e6;" | Caribbean Sea ! scope="row" | 🇭🇹 ! scope="row" style="background:#b0e0e6;" | Caribbean Sea ! scope="row" | 🇨🇴 ! scope="row" | 🇻🇪 ! scope="row" | 🇨🇴 ! scope="row" | 🇵🇪 ! scope="row" | 🇧🇷 ! scope="row" | 🇵🇪 ! scope="row" | 🇧🇷 ! scope="row" | 🇵🇪 ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Gulf of Ancud ! scope="row" style="background:#b0e0e6;" | Gulf of Corcovado ! scope="row" | ! 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