Berthe Marcelle Mayer (12 June 1913 – August 1981) worked for the Special Operations Executive (SOE) on Madagascar during the Second World War.

Berthe and Percy lived on the island, and started sending intelligence reports to SOE in Durban.

Admiral Godfrey, the director of Naval Intelligence, wrote a personal letter of thanks, describing it as "a very fine show indeed".

The authorities suspected Berthe, and searched the house looking for a radio transmitter, but were unable to find any evidence of her intelligence activities.

[2] In November 1943, Lord Harlech, the High Commissioner to South Africa, presented Berthe with the MBE in recognition of her work.