Karl Willy Wagner (22 February 1883 – 4 September 1953) was a German pioneer in the theory of electronic filters.

important contributions were slow to diffuse outside Germany because of the accidental intervention of World Wars I and II.The other German being referred to is Wilhelm Cauer.

Wagner was the second referee on Cauer's milestone 1926 thesis[2] but Wagner fell out with Cauer in 1942 after he refused to support Wagner's research proposals with the German Society of Electrical Engineers (Verband der Elektrotechnik - the VDE).

[3] Wagner was removed from office in 1936 because he refused to dismiss his Jewish employees.

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