Marguerite, Baroness de Reuter (14 July 1912 – 25 January 2009) was a European aristocrat and the last surviving member of the family that founded the Reuters news service.
She was the wife of Oliver, 4th Baron de Reuter, whose grandfather, Paul Reuter, established the Reuters news service in London in 1851.
Paul Reuter, a Jew who settled in the United Kingdom and converted to Christianity, had previously begun his career in journalism in Aachen, Germany, using carrier pigeons and telegraphs.