Terence Edward Armstrong (7 April 1920 – 21 February 1996) was a British polar geographer, sea ice specialist, writer, and expert on the Russian Arctic.
During the Second World War he served in the Army Intelligence Corps and the 1st Airborne Division in North Africa, Italy and Holland, being wounded as a parachutist at Arnhem, and Oslo where he led a contingent of soldiers.
Following the War he returned to Cambridge where he became the first fellow in Soviet Arctic Studies between 1947 and 1956 at the Scott Polar Research Institute (SPRI), a position especially created for him.
Armstrong's work was appreciated and trusted within the Soviet Union, this demonstrated when he was invited to Moscow to give the funeral oration for his Russian friend and fellow geographer Boris Kremer.
His work became important with scholars and researchers to a broader Arctic study, particularly geographers George Rogers, the Canadian-based Graham Rowley, and the Alaskans Vic Fischer and Frank Darnell.