Košir, sometimes Germanized Koschier, is a Slovenian surname. Notable people with the surname include:
Dejan Košir (born 1973), Slovenian snowboarder Jure Košir (born 1972), Slovenian alpine skier Lovrenc Košir (1804–1879), Austrian civil servant Manca Košir (born 1948), Slovenian journalist and actress Nick Kosir, American meteorologist Žan Košir (born 1984), Slovenian snowboarder Giuseppe Koschier (1936–2021), Austrian footballer
See also