Theodor Hilsdorf (18 June 1868, Bingen – 1944, Munich) was a German photographer who held an official position at the Royal Bavarian Court.
They were married in 1894, after he had spent a year in the United States, and had several children, including Johanna (1900–1997) and Carola (1903–1983), who were employed at the Deutsche Werkstätten Hellerau.
In 1905, he was appointed "Royal Bavarian Court Photographer" by Prince Regent Luitpold.
He did not, however, limit himself to photographing the Royal Family; he also did portraits of faculty from the Academy of Fine Arts, theatre actors, and opera singers.
His portraits of Stefan George, Richard Strauss and Ferdinand Graf von Zeppelin became part of the standard publishing repertoire until the 1930s.