The Tehuelche people, also called the Aónikenk, are an Indigenous people from eastern Patagonia in South America. In the 18th and 19th centuries the Tehuelche were influenced by Mapuche people, and many adopted a horseriding lifestyle. Once a nomadic people, the lands of the Tehuelche were colonized in the 19th century by Argentina and Chile, gradually disrupting their traditional economies. The establishment of large sheep farming estates in Patagonia was particularly detrimental to the Tehuelche. Contact with outsiders also brought in infectious diseases ushering deadly epidemics among Tehuelche tribes. Most existing members of the group currently reside in cities and towns of Argentine Patagonia.

Patagonia is a geographical region that encompasses the southern end of South America, governed by Argentina and Chile. The region comprises the southern section of the Andes Mountains with lakes, fjords, temperate rainforests, and glaciers in the west and deserts, tablelands, and steppes to the east. Patagonia is bounded by the Pacific Ocean on the west, the Atlantic Ocean to the east, and many bodies of water that connect them, such as the Strait of Magellan, the Beagle Channel, and the Drake Passage to the south.