The 81st parallel north is a circle of latitude that is 81 degrees north of the Earth's equatorial plane, in the Arctic. It crosses the Atlantic Ocean, the Arctic Ocean, Europe, Asia and North America. At this latitude the sun is always visible during the summer solstice and astronomical twilight during the winter solstice.

Around the world

Starting at the Prime Meridian and heading eastwards, the parallel 81° north passes through: ! scope="col" width="125" | Coordinates ! scope="col" | Country, territory or sea ! scope="col" | Notes ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" | 🇷🇺 ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" | 🇷🇺 ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" | 🇷🇺 ! scope="row" style="background:#b0e0e6;" | Kara Sea ! scope="row" | 🇷🇺 ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Nansen Sound ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Nares Strait ! scope="row" | 🇬🇱 ! scope="row" | 🇬🇱 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean