Reinhold Poss (11 September 1897 – 26 August 1933) was a German flying ace and racing pilot. Poss enlisted with the Imperial German Navy during World War I and scored eleven kills as a naval pilot. In May 1918 he took command of the Seefrontstaffel and in September 1918 of the IV. Marinefeldjasta, which he led until 15 October, when he was shot down and captured. He spent the final month of the war in a POW camp.
Following the war, Poss achieved further fame as a pilot, completing, with Hermann Köhl, the first night-time flight between Warnemünde and Stockholm, Sweden. Poss competed in three Fédération Aéronautique Internationale air races, Challenge 1929 (finishing 15/16th overall), Challenge 1930 (2nd overall), and Challenge 1932 (tying Fritz Morzik for 2/3rd).