Maximilian (Max) Westermaier (6 May 1852, Kaufbeuren – 1 May 1903, Fribourg) was a German botanist.
He studied sciences at the University of Munich, where he was influenced by botanists Ludwig Radlkofer and Carl Wilhelm von Nägeli.
In 1887 he relocated to Königsberg as a temporary replacement for the late Robert Caspary (1818–1887).
[2][3] In 1896, with the support of Pope Leo XIII, he became the first professor of botany at the University of Fribourg, a position he maintained until his death in 1903.
[5][6] Other noted works by Westermaier are Zur Embryologie der Phanerogamen, insbesondere über die sogenannten Antipoden ("The embryology of phanerogams, particularly in the so-called Antipodes", 1890).