Rose Mackenberg (July 10, 1892 – April 10, 1968) was an American investigator specializing in fraudulent psychic mediums, known for her association with Harry Houdini. She was chief of a team of undercover investigators who investigated mediums for Houdini in the 1920s. After Houdini's death she continued to investigate spiritualist fraud for over 20 years and was known as an expert on the subject. She testified in court cases and before Congress and was interviewed in national magazines and on television.