Maximilian Hussarek von Heinlein (3 May 1865 – 6 March 1935), ennobled to the rank of Baron (Freiherr) in 1917, was an Austrian statesman who served as the penultimate Minister-President of Cisleithania in the last stage of World War I, for three months in 1918.

He worked for the recognition of Evangelical professorships at the theological department of the Vienna University and had Sunni Islam, according to the Hanafi school of jurisprudence, acknowledged as a religious community.

When after the conclusion of the Treaty of Brest-Litovsk with the Ukrainian People's Republic, Minister-president Ernst Seidler von Feuchtenegg resigned on 25 July 1918, Hussarek was appointed his successor.

Facing the American entry into World War I, and the disintegration of the Austro-Hungarian Monarchy, as well as rapidly deteriorating supply conditions, he tried in vain to hinder the collapse by an Imperial manifesto (Völkermanifest).

The declaration failed: while several constituent national assemblies convened in the Austrian crown lands, the manifesto was rejected by the Hungarian minister-president Sándor Wekerle and two days later the Budapest government officially terminated the Austro-Hungarian Compromise of 1867.