The meridian 178° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, the Pacific Ocean, New Zealand, the Southern Ocean, and Antarctica to the South Pole.
The 178th meridian east forms a great circle with the 2nd meridian west.
Starting at the North Pole and heading south to the South Pole, the 178th meridian east passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| East Siberian Sea | ||
| Chukotka Autonomous Okrug | ||
| Anadyrskiy Liman | ||
| Chukotka Autonomous Okrug | ||
| Bering Sea | Passing just west of Segula Island, Alaska, (at) | |
| Pacific Ocean | ||
| Island of Viti Levu | ||
| Pacific Ocean | ||
| Island of Yanutha | ||
| Pacific Ocean | ||
| Kadavu Island | ||
| Pacific Ocean | ||
| North Island — passing through the city of Gisborne (at) | ||
| Pacific Ocean | ||
| Southern Ocean | ||
| Antarctica | Ross Dependency — claimed by | |