Karl ("Carlo") Wien (10 September 1906 – c. 14 June 1937) was a German mountaineer.

His mountaineering career began in the Alps, where with Willi Welzenbach he made the first ascent of the north face of the Grossglockner.

[1] Outside Europe he made a number of visits to Africa and the Himalaya, including Paul Bauer's 1931 attempt on Kangchenjunga, and a 1936 expedition to Sikkim during which he made the first ascent of Siniolchu.

[1] In 1937, Karl Wien was chosen to lead a German expedition to Nanga Parbat, the first since ten climbers had died on the mountain in 1934.

All sixteen men were killed in what remains the worst single disaster ever to occur on an eight thousand metre peak.