Gordon Clunes Mackay Mathison FRCP (10 August 1883 – 18 May 1915) was a physician, medical researcher, and soldier. Appointed the first director of the Walter and Eliza Hall Institute of Medical Research in Melbourne, Australia, he died on 18 May 1915, from wounds received in action on 10 May 1915 during the Gallipoli campaign, before he could take up the position.