Helga Deen (6 April 1925 – 16 July 1943) was a Jewish[1] diarist whose diary was discovered in 2004, which describes her stay in a Dutch prison camp, Kamp Vught, where she was brought during World War II at the age of 18.

Initially her father lived with his German GP wife in Germany, but moved back to the Netherlands as persecution increased.

She was given leave to remain but chose to accompany her family to Sobibor, where she became one of the millions who was murdered in the Nazis' gas chambers.

Deen wrote the diary for her boyfriend, Kees van den Berg, who kept it hidden after the war.

A memorial stone to Helga and her family has been placed by a member of the Dutch Sobibor Foundation on the pathway which used to lead to the gas chambers (called the "Road to Heaven").