Banner Carruthers Johnstone (11 November 1882 – 20 June 1964) was a British oarsman who competed in the 1908 Summer Olympics.

[1] Johnstone was born in Bebington, then lived in Cheshire, and was educated at Eton, where he was captain of the boats, and at Trinity College, Cambridge, where he was a member of the Pitt Club.

He also competed in the Grand Challenge Cup in a series of contests with the Belgian Royal Club Nautique de Gand, being twice on the winning side.

[3] In 1908 he was a crew member of the Leander eight, which won the gold medal for Great Britain rowing at the 1908 Summer Olympics.

At the start of World War I, he was in the Transport Corps in East Africa, but went to France in 1917 with the 1st Black Watch and 1st Infantry Brigade.