The meridian 103° 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. In the United States, the border between New Mexico and Oklahoma is defined by the meridian. The 103rd meridian west forms a great circle with the 77th meridian east.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 103rd 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;" | Maclean Strait ! scope="row" style="background:#b0e0e6;" | Unnamed waterbody ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Austin Channel ! scope="row" style="background:#b0e0e6;" | Parry Channel ! scope="row" style="background:#b0e0e6;" | M'Clintock Channel ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Queen Maud Gulf ! scope="row" | 🇨🇦 ! scope="row" | 🇺🇸 ! 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