The meridian 103° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole. The 103rd meridian east forms a great circle with the 77th meridian west.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 103rd meridian east 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" style="background:#b0e0e6;" | Laptev Sea ! scope="row" | 🇷🇺 ! scope="row" style="background:#b0e0e6;" | Kara Sea ! scope="row" | 🇷🇺 ! scope="row" | 🇲🇳 ! scope="row" | ! scope="row" | 🇻🇳 ! scope="row" | 🇱🇦 ! scope="row" | 🇹🇭 ! scope="row" | 🇰🇭 ! scope="row" style="background:#b0e0e6;" | Gulf of Thailand ! scope="row" style="background:#b0e0e6;" | South China Sea ! scope="row" | 🇲🇾 ! scope="row" style="background:#b0e0e6;" | Gulf of Thailand ! scope="row" | 🇲🇾 ! scope="row" style="background:#b0e0e6;" | Strait of Malacca ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Indian Ocean ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica