The 1939–40 Gauliga Ostmark was the second season of the Gauliga Ostmark, the first tier of football in German-annexed Austria from 1938 to 1945, officially referred to as Ostmark.
[1] SK Rapid Wien won the championship and qualified for the 1940 German football championship where it lost 2–1 after extra time in the semi-final to Dresdner SC.
Rapid went on to win the third-place play-off against SV Waldhof Mannheim.
[2][3] The Gauliga Ostmark and Gauliga Donau-Alpenland titles from 1938 to 1944, excluding the 1944–45 season which was not completed, are recognised as official Austrian football championships by the Austrian Bundesliga.
[4] The 1939–40 season saw one new club in the league, FC Wien.