Alexander Freiherr von Wangenheim (31 October 1872 – 1 March 1959) was a German Nazi politician.
After the end of the First World War, Wangenheim helped found the Brandenburgischen Bauernhochschule (Brandenburg Farmers' College) in Neuruppin, where he worked until the autumn of 1927.
In 1928, von Wangenheim became director of the Märkische Farmers' College (Bauernhochschule Vereins Brandenburgischer Bauern und Bauernhochschüler).
In that year he was promoted to Sturmabteilung (SA) leader in Brandenburg and the Ostmark, and also was appointed Gau and Reich speaker of the NSDAP.
The most important parliamentary event in which Wangenheim participated during his time as a member of parliament was the passing of the Enabling Act in March 1933.