The meridian 112° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.
The 112th meridian west forms a great circle with the 68th meridian east.
Starting at the North Pole and heading south to the South Pole, the 112th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Northwest Territories — Borden Island | ||
| Wilkins Strait | ||
| Northwest Territories — Mackenzie King Island | ||
| Unnamed waterbody | ||
| Northwest Territories — Melville Island | ||
| Liddon Gulf | ||
| Northwest Territories — Melville Island | ||
| Parry Channel | Viscount Melville Sound | |
| Northwest Territories — Victoria Island Nunavut — from on Victoria Island | ||
| Coronation Gulf | ||
| Nunavut — Duke of York Archipelago | ||
| Coronation Gulf | ||
| Nunavut Northwest Territories — from, passing through the Great Slave Lake Alberta — from | ||
| Montana Idaho — from Utah — from, passing just west of Salt Lake City at Arizona — from, passing through Phoenix at | ||
| Sonora | ||
| Gulf of California | ||
| Baja California Sur | ||
| Magdalena Bay | ||
| Baja California Sur — Isla Santa Margarita | ||
| Pacific Ocean | Passing just east of Roca Partida, Revillagigedo Islands, at | |
| Southern Ocean | ||
| Antarctica | Unclaimed territory | |