Augusto Hamann Rademaker Grünewald (11 May 1905 – 13 September 1985) was a Brazilian admiral.

Rademaker was one of the leaders of the Military Junta (30 August 1969 – 30 October 1969) that ruled Brazil between the illness of Artur da Costa e Silva in August 1969 and the investiture ceremony of Emílio Garrastazu Médici in October of that same year, elected by fellow officer generals and confirmed by the Congress.

In the same occasions Rademaker was picked and "elected" as vice president for the same term as Medici's (1969–1974).

[1] During his tenure as vice president he was awarded[2] one of Portugal's highest honors, the Grand-Cross of the Order of the Tower and Sword on 26 July 1972.

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