The meridian 84° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Gulf of Mexico, the Caribbean Sea, Central America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole. The 84th meridian west forms a great circle with the 96th meridian east.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 84th 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;" | Jones Sound ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Lancaster Sound ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Fury and Hecla Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Foxe Basin ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Fisher Strait ! scope="row" style="background:#b0e0e6;" | Hudson Bay ! scope="row" | 🇨🇦 ! scope="row" | 🇺🇸 ! scope="row" style="background:#b0e0e6;" | Lake Huron ! scope="row" | 🇺🇸 ! scope="row" style="background:#b0e0e6;" | Gulf of Mexico ! scope="row" | 🇨🇺 ! scope="row" style="background:#b0e0e6;" | Caribbean Sea ! scope="row" | 🇭🇳 ! scope="row" | 🇳🇮 ! scope="row" | 🇨🇷 ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica