Louise Catherine Breslau (6 December 1856 – 12 May 1927) was a Swiss artist.
Born Maria Luise Katharina Breslau in Munich, Germany, she spent her childhood in Zurich, Switzerland and as an adult made Paris, France her home. Suffering from asthma all her life, Breslau turned to drawing as a child to help pass the time while confined to her bed. Although she became one of the most sought after portraitists of her time, after her death she and her work were all but forgotten. It has only been in the past few years that interest in Breslau and her works has been growing.
Breslau was born into a prosperous bourgeois family; her father was a well-respected physician specializing in obstetrics and gynecology. When Breslau was two years old, her father accepted the position of professor and head physician of Obstetrics and Gynecology at the University of Zurich; Switzerland became home to the Breslau family. Tragedy hit in December 1866 when Dr. Breslau died suddenly from a staph infection contracted while performing a post-mortem examination.