Bertha Müller was an Austrian painter.

Müller was born on 28 October 1848 in Vienna. She was the sister of Marie Müller and the Austrian genre painter Leopold Carl Müller. She exhibited her work in the rotunda of The Woman's Building at the 1893 World's Columbian Exposition in Chicago, Illinois. Her paintings include a portrait of the fashion designer Emilie Louise Flöge with a mandolin and her portrait of Queen Victoria is in the collection of the National Portrait Gallery, London. Müller died in 1925.