The 77th parallel north is a circle of latitude that is 77 degrees north of the Earth's equatorial plane, in the Arctic. It crosses the Atlantic Ocean, Europe, Asia, the Arctic Ocean and North America. It is the northernmost integral parallel that passes through continental mainland (namely the Taymyr Peninsula of Siberia).
At this latitude the sun is visible for 24 hours, 0 minutes during the summer solstice and nautical twilight during the winter solstice.
Starting at the Prime Meridian and heading eastwards, the parallel 77° north passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Atlantic Ocean | Greenland Sea | |
| Svalbard - island of Spitsbergen | ||
| Barents Sea | ||
| Novaya Zemlya - Severny Island (northernmost point) | ||
| Kara Sea | ||
| Slozhnyy Island | ||
| Kara Sea | ||
| Russkiy Island | ||
| Kara Sea | ||
| Taymyr Peninsula | ||
| Laptev Sea | ||
| Faddey Islands | ||
| Laptev Sea | ||
| Arctic Ocean | ||
| East Siberian Sea | Passing just south of Henrietta Island, | |
| Arctic Ocean | ||
| Northwest Territories - Prince Patrick Island | ||
| Moore Bay | ||
| Unnamed waterbody | Passing just north of Emerald Isle, Northwest Territories, Passing just south of Fitzwilliam Owen Island, Northwest Territories, Passing just south of Eight Bears Island, Northwest Territories, | |
| Hazen Strait | Passing just north of Vesey Hamilton Island, Nunavut, | |
| Byam Martin Channel | ||
| Desbarats Strait | Passing just south of the Findlay Group, Nunavut, | |
| Unnamed waterbody | ||
| Nunavut - Crescent Island | ||
| Napier Bay | ||
| Nunavut - Devon Island | ||
| Norwegian Bay | ||
| Nunavut - Ellesmere Island | ||
| Baffin Bay | Smith Bay | |
| Nunavut - Ellesmere Island | ||
| Baffin Bay | ||
| Steensby Land | ||
| Germania Land | ||
| Atlantic Ocean | Greenland Sea | |