Meinhof was born in 1934 in Oldenburg. Her father died of cancer in 1940, causing her mother to take in a boarder, Renate Riemeck, to make money. In 1946, the family moved back to Oldenburg after Jena fell under Soviet occupation as a result of the Yalta agreement. Meinhof's mother, Dr. Ingeborg Meinhof, an art historian, began to work as a teacher and died from cancer in 1949. Riemeck took on the role of guardian of Meinhof and her elder sister, Wienke.