Major General Colin Hall Simpson, CBE, MC, VD (13 April 1894 – 23 August 1964) was an Australian Army officer who rose to the rank of major general as Signal Officer in Chief during the Second World War. He was one of the founders of Amcal, the largest retail pharmacy chain in Australia. During the Second World War he participated in the campaigns in Greece and Syria as Chief Signals Officer of the I Corps. He returned to Australia in 1942 to become the Australian Army's Signal Officer in Chief. He also became the first Australian Corps of Signals officer to reach the rank of major general.