Alone is an American survival competition series on History. It follows the self-documented daily struggles of 10 individuals (seven paired teams in season 4) as they survive alone in the wilderness for as long as possible using a limited amount of survival equipment. With the exception of medical check-ins, the participants are isolated from each other and all other humans. They may "tap out" at any time, or be removed due to failing a medical check-in. The contestant who remains the longest wins a grand prize of $500,000 (USD) (increasing to $1 million in season 7). The seasons have been filmed across a range of remote locations, usually on Indigenous-controlled lands, including northern Vancouver Island, British Columbia, Nahuel Huapi National Park in Argentina, Patagonia, Northern Mongolia, Great Slave Lake in the Northwest Territories, and Chilko Lake in interior British Columbia.

The series premiered on June 18, 2015. On August 19, before the finale of season 1, it was announced that the series had been renewed for a second season, which would begin production in the fall of 2015 on Vancouver Island, Canada. Season 2 premiered on April 21, 2016. Season 3 was filmed in the second quarter of 2016 in Patagonia, Argentina, and premiered on December 8. One day before the season 3 premiere, History announced that casting had begun for season 4. Season 4 was set in Northern Vancouver Island with a team dynamic and premiered on June 8, 2017. Season 5 was set in Northern Mongolia and allowed losers from previous seasons to return and compete. It premiered on June 14, 2018. Season 6 premiered on June 6, 2019 and featured ten all-new contestants between the ages of 31 and 55. It was set just south of the Arctic Circle on a lake in the Northwest Territories of Canada.

The seventh season premiered on June 11, 2020. Participants attempted to survive for 100 days in the Arctic in order to win a $1 million prize. Season 9 sent contestants to the northeast of Canada in Labrador. A tenth season premiered on June 8, 2023. Spin-offs and international versions of the series have also since been made.