Adair Macalister "Chill" Blain (21 November 1894 – 28 April 1983) was a long serving independent member of the Australian House of Representatives.Born in Inverell, New South Wales, Blain was educated in Perth, Western Australia and the University of Adelaide and worked as a surveyor in Western Australia.Following the outbreak of World War I, Blain served as a corporal in the 32nd Battalion of the First Australian Imperial Force in France from 1916 to 1919, during which he was wounded twice.