The meridian 100° 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.
Starting at the North Pole and heading south to the South Pole, the 100th meridian east passes through:
| Country, territory or sea | Notes |
|---|---|
| Arctic Ocean | |
| October Revolution Island and Bolshevik Island | |
| Arctic Ocean | Kara Sea |
| Gulf of Thailand | |
| Islands of Ko Pha Ngan and Ko Samui, and the Malay Peninsula | |
| Strait of Malacca | Passing just west of Penang Island, |
| Islands of Sumatra and North Pagai | |
| Indian Ocean | |
| Southern Ocean | |
| Antarctica | Australian Antarctic Territory, claimed by |
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