The meridian 115° 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. The 115th meridian west forms a great circle with the 65th meridian east. Between the equator and the 60th parallel south it forms the eastern boundary of the South Pacific Nuclear-Weapon-Free Zone and the western boundary of the Latin American Nuclear-Weapon-Free Zone.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 115th 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;" | Ballantyne Strait ! scope="row" style="background:#b0e0e6;" | Unnamed waterbody ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | M'Clure Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Prince Albert Sound ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Dolphin and Union Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Coronation Gulf ! 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