The meridian 12° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Europe, Africa, the Atlantic Ocean, the Southern Ocean, and Antarctica to the South Pole. The 12th meridian east forms a great circle with the 168th meridian west.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 12th meridian east 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" | 🇳🇴 ! 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" | 🇸🇪 ! scope="row" | 🇳🇴 ! scope="row" | 🇸🇪 ! scope="row" style="background:#b0e0e6;" | Kattegat ! scope="row" | 🇩🇰 ! scope="row" style="background:#b0e0e6;" | Baltic Sea ! scope="row" | 🇩🇪 ! scope="row" | 🇦🇹 ! scope="row" | 🇮🇹 ! scope="row" style="background:#b0e0e6;" | Mediterranean Sea ! scope="row" | 🇮🇹 ! scope="row" style="background:#b0e0e6;" | Mediterranean Sea ! scope="row" | 🇱🇾 ! scope="row" | 🇳🇪 ! scope="row" | 🇳🇬 ! scope="row" | 🇨🇲 ! scope="row" | 🇬🇦 ! scope="row" | 🇨🇬 ! scope="row" | 🇬🇦 ! scope="row" | 🇨🇬 ! scope="row" | 🇬🇦 ! scope="row" | 🇨🇬 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇦🇴 ! scope="row" | 🇳🇦 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica