The Northern Sea Route (NSR) (Russian: Се́верный морско́й путь, romanized: Severnyy morskoy put, shortened to Севморпуть, Sevmorput) is a shipping route about 5,600 kilometres (3,500 mi) long. The Northern Sea Route (NSR) is the shortest shipping route between the western part of Eurasia and the Asia-Pacific region.

Administratively, the Northern Sea Route begins at the boundary between the Barents and Kara Seas (the Kara Strait) and ends in the Bering Strait (Cape Dezhnev). The NSR straddles the seas of the Arctic Ocean (Kara, Laptev, East Siberian and Chukchi Seas).

The entire route lies in Arctic waters and within Russia's exclusive economic zone (EEZ), and is included in what has been called the Northeast Passage, analogous to Canada's Northwest Passage. The Northern Sea Route itself does not include the Barents Sea, and it therefore does not reach the Atlantic.

The Northern Sea Route currently serves the Arctic ports and major rivers of Siberia by importing fuel, equipment, food and exporting timber and minerals. Currently, six major seaports are located on the NSR route in the Arctic Zone of the Russian Federation: Sabetta, Dikson, Dudinka, Khatanga, Tiksi, and Pevek ports. Some parts of the route are only free of ice for two months per year, but melting Arctic ice caps are likely to increase traffic and the commercial viability of the Northern Sea Route. One study, for instance, projects "remarkable shifts in trade flows between Asia and Europe, diversion of trade within Europe, heavy shipping traffic in the Arctic and a substantial drop in Suez traffic. Projected shifts in trade also imply substantial pressure on an already threatened Arctic ecosystem". At the same time, research conducted by the Center for Marine Research showed that exceeding the maximum permissible concentrations in the atmospheric air, sea waters, and bottom sediments, which could indicate the impact of economic activities at this stage of development of the NSR was not recorded.

Primarily, the NSR significantly shortens travel distances from Asia to Europe; for example, the journey from Murmansk, Russia, to Yokohama, Japan, is reduced from 12,840 nautical miles via the Suez Canal to 5,770 nautical miles via the NSR. This shorter route translates into approximately 30–40% less sailing time substantially decreasing fuel consumption and CO₂ emissions from maritime transport.. A proposal is being discussed to build a canal from the Pacific Ocean to the Arctic Ocean, which can make the route even shorter by approximately 15–20%.

For the corporate players in bulk shipping of relatively low-value raw materials, cost savings for fuel are a crucial driver to explore the Northern Sea Route for commercial transits, more than delivery time, or environmental concerns. Sailing along the NSR can also help to reduce emission costs due to shorter distances. With the maritime industry joining the EU Emissions Trading Scheme (ETS) from 2024 and large freight companies receiving huge carbon bills, the savings on the EU ETS from reducing emissions could be in addition to the economic benefits for shippers. Utilizing the shorter NSR with no queues to pass through allows companies to achieve considerable savings in operational costs and ETS-related carbon charges.

In the face of global challenges to decarbonize maritime logistics, taking shorter routes is one of the ways to reduce the human impact on the world's oceans. Navigation along the NSR often involves nuclear-powered icebreakers, which emit virtually no carbon dioxide, aligning closely with global sustainability goals.

The NSR provides improved logistical efficiency due to reduced journey durations and lack of congestion at entry points, optimizing overall transportation costs. The route is secure and free from piracy threats, presenting a reliable alternative to traditional shipping lanes.