The meridian 172° 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 172nd meridian east forms a great circle with the 8th meridian west.
Starting at the North Pole and heading south to the South Pole, the 172nd meridian east passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| East Siberian Sea | ||
| Chukotka Autonomous Okrug Kamchatka Krai — from | ||
| Bering Sea | ||
| Pacific Ocean | Passing just east of Arno Atoll, (at) | |
| Mili Atoll | ||
| Pacific Ocean | Passing just west of Hunter Island, (claimed by) (at) Passing just west of the Three Kings Islands, (at) | |
| South Island – West Coast and Canterbury regions | ||
| Pacific Ocean | ||
| Southern Ocean | ||
| Antarctica | Ross Dependency, claimed by | |