The meridian 166° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.
The 166th meridian east forms a great circle with the 14th meridian west.
Starting at the North Pole and heading south to the South Pole, the 166th meridian east passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| East Siberian Sea | ||
| Chukotka Autonomous Okrug Kamchatka Krai — from | ||
| Bering Sea | ||
| Kamchatka Krai — Bering Island | ||
| Pacific Ocean | ||
| Wotho Atoll | ||
| Pacific Ocean | Passing between the atolls of Ujae (at) and Lae (at), Passing just west of the Reef Islands, (at) Passing just east of the island of Tinakula, (at) | |
| Islands of Nendo and Nibanga | ||
| Coral Sea | ||
| Coral Sea | ||
| Pacific Ocean | ||
| Auckland Island and Adams Island | ||
| Pacific Ocean | ||
| Southern Ocean | ||
| Antarctica | Ross Dependency, claimed by | |
| Southern Ocean | Ross Sea | |
| Antarctica | Ross Dependency, claimed by | |