Ruth Closius was an SS supervisor at a death camp complex from December 1944 until March 1945.

Ruth Closius was born to an ethnic German family in Breslau, Poland on July 5, 1920. Ruth later married and became Ruth Neudeck. In July 1944 she arrived at the Ravensbrück camp to begin her training to be a camp guard. Ruth soon began impressing her superiors with her unbending brutality towards the women prisoners, so she was promoted to the rank of Blockführerin (Barrack Overseer) in late July 1944. In the Ravensbrück camp, Ruth was known as one of the worst female guards. One former prisoner commented after the war that she had seen wardress Neudeck "cut the throat of an inmate with the sharp edge of her shovel." In December 1944, Ruth was promoted to the rank of Oberaufseherin and moved to the Uckermark extermination complex down the road from Ravensbrück. There she involved herself in the selection and execution of over 5,000 women and children. The prisoners were also mistreated by Ruth or her SS Aufseherinnen. In March 1945, Ruth became head of the Barth subcamp. In late April 1945, Ruth fled from the camp. She was later captured and put in prison while the British Army investigated her crimes. In April 1948, Ruth stood accused at the third Ravensbrück Trial along with other SS women. The twenty-eight year old former SS supervisor confessed to all the accusations of murder and maltreatment in her deposition. She was quoted as saying, "As I took over the Uckermark camp, there were approximately 4,000 prisoners of all nationalities present. When I was reposted after approximately 6 weeks later, only 1,000 prisoners were remaining. During my activity approximately 3,000 women were selected for the gas chamber accordingly." The British court found her guilty of war crimes and executed her on July 29, 1948.

The majority of the information about the birthplace and birthdate of Ruth was found in Daniel Patrick Brown 's book "THE CAMP WOMEN The Female Auxiliaries Who Assisted the SS in Running the Concentration Camp System"

Information about the camp service of Ruth Closius was found on the website http://www.geocities.com/biskupia/closius.htm

The testimony of Ruth Closius during her trial can be found at http://www.zyklon-b.info/anwendung/ravensbrueck.htm