Thomas Simpson was a Scottish Arctic explorer, Hudson's Bay Company fur trader, and cousin of Company Governor Sir George Simpson. He helped chart the northern coasts of Canada. He died by violence near the Turtle River while traveling through the wilderness in what is now the U.S. state of North Dakota but was then part of the Territory of Iowa. The circumstances of his final hours—in which he allegedly killed himself after gunning down two companions—have long been a subject of controversy.

Arctic exploration is the physical exploration of the Arctic region of the Earth. It refers to the historical period during which mankind has explored the region north of the Arctic Circle. Historical records suggest that humankind have explored the northern extremes since 325 BC, when the ancient Greek sailor Pytheas reached a frozen sea while attempting to find a source of the metal tin. Dangerous oceans and poor weather conditions often fetter explorers attempting to reach polar regions, and journeying through these perils by sight, boat, and foot has proven difficult.