Max Udo Hollrung (born 25 October 1858 in Hosterwitz, Dresden, died 5 May 1937 in Halle (Saale)) was a German botanist, and an early specialist in phytopathology.

After a three-year assistantship at the Agriculture-Chemical Experimental Station in Halle (Saale), he participated in a research expedition to New Guinea from 1886 to 1888.

At his return, Julius Kühn transferred him to the Agricultural Institute of the University of Halle, to work in the newly established Research Center for Nematode Control.

From 1898 Hollrung was head of the experimental station for crop protection of the Chamber of Agriculture of the province of Saxony in Halle / Saale.

As a researcher, he played a significant role in the examination of copper salts as a plant protection product, in the study of diseases of grapevine and potato.