The meridian 46° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Greenland, the Atlantic Ocean, South America, the Southern Ocean, and Antarctica to the South Pole.
The 46th meridian west forms a great circle with the 134th meridian east.
Starting at the North Pole and heading south to the South Pole, the 46th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Lincoln Sea | ||
| Sverdrup Island | ||
| Lincoln Sea | ||
| Island of Nares Land | ||
| Victoria Fjord | ||
| Wulff Land | ||
| Atlantic Ocean | ||
| Maranhão Tocantins — from Bahia — from Goiás — from Bahia — for about 16 km from Minas Gerais — for about 9 km from Bahia — for about 9 km from Minas Gerais — from São Paulo — from, passing just west of São José dos Campos at | ||
| Atlantic Ocean | ||
| Southern Ocean | ||
| South Orkney Islands | Coronation Island — claimed by both (Tierra del Fuego Province) and (British Antarctic Territory) | |
| Southern Ocean | ||
| Antarctica | Claimed by both (Argentine Antarctica) and (British Antarctic Territory) | |