Mount Sisu is a mountain in the Antarctic. Finnish mountaineers Veikka Gustafsson and Patrick Degerman were the first people to ascend it, in 1997. It was named after the Finnish concept of sisu, meaning a sense of steadfast, rugged perseverance. The name has not been officially sanctioned by the United States Geological Survey, as it is not found on their Geographic Names Information System, nor does it meet the organization's standards for geological nomenclature on the Antarctic continent.