Rachel "Didi" Harel (née Roos; 13 April 1923, Rotterdam, the Netherlands – 16 November 1989, Herzliya, Israel), was a member of the Dutch Resistance against the Nazis during World War II, and was awarded the American Medal of Freedom and the British King's Medal for Courage in the Cause of Freedom.
From that time, 1943–1945, Rachel was involved in the Dutch Resistance, and so was her fiancé, Marcel, who went by the fictitious name of Rienus van Elck.
Rachel was involved in the sabotage of Germans' orders and in reaching and assisting the Battle of Arnhem's Allied Forces.
Three months later, as the Allies got closer to the Netherlands, she was transferred to the Westerbork transit camp, and from there she was sent to the death march, from which she escaped.
On 21 November 1946, in a ceremony that took place in Tropenmuseum Amsterdam, Rachel was awarded the United States Medal of Freedom.
On 18 October 1948 in the British Embassy in The Hague, she was awarded the United Kingdom King's Medal for Courage in the Cause of Freedom.
Rachel died in 1989, after coming back home from a ceremony at Yad Vashem in the Netherlands, in which the Nagtegaal family was recognized as Righteous among the Nations.