'Blau' (ii) was a German unrealised contingency plan, later redesignated as 'Planstudie 39', developed by General Hellmuth Felmy’s Luftwaffengruppenkommando 2 for air operations against the UK in the event of war between Germany and the UK after the German annexation of the Sudetenland part of Czechoslovakia (22 September 1938).

The German success at the Munich Conference in September 1938 rendered the plan superfluous, but some of its elements were later incorporated into 'Adlerangriff' from 7 February 1939.