The meridian 3° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, the Atlantic Ocean, Europe, Africa, the Southern Ocean, and Antarctica to the South Pole. The 3rd meridian west forms a great circle with the 177th meridian east.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 3rd meridian west passes through: ! scope="col" width="125" | Co-ordinates ! scope="col" | Country, territory or sea ! scope="col" | Notes ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | ! scope="row" style="background:#b0e0e6;" | North Sea ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Scapa Flow ! scope="row" | ! scope="row" style="background:#b0e0e6;" | North Sea ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Firth of Forth ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Irish Sea ! scope="row" | England — passing just west of Liverpool (at 53.4°N, -3°W) Wales — from 53.23333°N, -3°W England — from 52.95°N, -3°W Wales — from 52.73333°N, -3°W England — from 52.71667°N, -3°W Wales — from 52.35°N, -3°W England — from 52.31667°N, -3°W Wales — from 52.26667°N, -3°W England — from 52.25°N, -3°W Wales — from 51.91667°N, -3°W ! scope="row" style="background:#b0e0e6;" | Bristol Channel ! scope="row" | ! scope="row" style="background:#b0e0e6;" | English Channel ! scope="row" | 🇫🇷 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇪🇸 ! scope="row" style="background:#b0e0e6;" | Mediterranean Sea ! scope="row" | 🇲🇦 ! scope="row" | 🇩🇿 ! scope="row" | undefined ! scope="row" | 🇧🇫 ! scope="row" | 🇨🇮 ! scope="row" | 🇬🇭 ! scope="row" | 🇨🇮 ! scope="row" | 🇬🇭 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica