|Full name||Magnus Andreas Thulstrup Clasen Konow|
|Born||1 September 1887
|Died||25 August 1972
San Remo, Italy
|Class(es)||6mR, 8mR, 12mR|
|Club||Royal Norwegian Yacht Club|
Magnus Andreas Thulstrup Clasen Konow (1 September 1887 – 25 August 1972) was a Norwegian sailor who competed in the 1908 Summer Olympics, in the 1912 Summer Olympics, in the 1920 Summer Olympics, in the 1928 Summer Olympics, in the 1936 Summer Olympics, and in the 1948 Summer Olympics.
In 1908 he was a crew member of the Norwegian boat Fram which finished fourth in the 8 metre class competition.
Four years later he won the gold medal as a crew member of the Norwegian boat Magda IX in the 12 metre class.
In 1920 he won his second gold medal as part of the Norwegian boat Sildra.
In his fourth Olympic Games he was a crew member of the Norwegian Noreg which finished fourth in the 8 metre class competition.
His sixth and last Olympic appearance was 1948 at the London Games. He was the helmsman of the Norwegian boat Apache which finished fourth in the 6 metre class competition.