During World War II, the Princess fled the Nazi invasion with her family, spending the wartime years in exile with her mother and siblings in Washington, DC.
Princess Ragnhild married Erling S. Lorentzen, a commoner of the Norwegian merchant upper-class, in Asker on 15 May 1953, after which the princess is titled Her Highness Princess Ragnhild, Mrs. Lorentzen. There was great controversy when the princess married Lorentzen, a business man and army officer who had served as her bodyguard during the War, as she was the first Norwegian Royal to marry a commoner. Soon after the couple's wedding, it was announced that the flag of Norway would no longer be flown on the princess's birthday (9 June). The couple moved to Rio de Janeiro, Brazil where her husband has substantial business holdings, originally as a temporary residence, but they eventually settled there, and remained her in until her death in 2012. Together, they have three children and six grandchildren:
- Haakon Lorentzen (1954)
- Olav Alexander Lorentzen (1985)
- Christian Frederik Lorentzen (May 1988)
- Sophia Anne Lorentzen (1994)
- Ingeborg Lorentzen (1957)
- Victoria Ragna Lorentzen Ribeiro (December 1988)
- Ragnhild Alexandra Lorentzen (1968)
- Alexandra Lorentzen Long (2007)
- Elizabeth Lorentzen Long (2011)
She is survived by her husband of 59 years, two daughters and son, two son-in-laws, a daughter-in-law, four granddaughters (ranging in ages from a year to 18 years of age), two grandsons (ages 27 & 24), an older sister, a brother-in-law, an older brother, a sister-in-law, four nieces, three nephews, a stepnephew, six great nieces, four great nephews, three nephews-in-law and two nieces in law.