Eduard Gustav Freiherr von Toll, better known in Russia as Eduard Vasilyevich Toll and often referred to as Baron von Toll, was a Russian geologist and Arctic explorer. He is most notable for leading the Russian polar expedition of 1900–1902 in search of the legendary Sannikov Land, a phantom island purported to lie off Russia's Arctic coast. During the expedition, Toll and a small party of explorers disappeared from Bennett Island, and their fate remains unknown to this day.

The Russian polar expedition of 1900–1902 was commissioned by the Saint Petersburg Academy of Sciences to study the Arctic Ocean north of New Siberian Islands and search for the legendary Sannikov Land. It was led by the Baltic German geologist and Arctic explorer Baron Eduard von Toll on the ship Zarya. Toll and his three assistants vanished in late 1902 while exploring Bennett Island. One of the key members of the expedition was Alexander Kolchak, then a young researcher and lieutenant of the Russian Navy, and later a provisional ruler of Russia during the civil war period. Kolchak also led the rescue mission to find Toll and his crew.