Marian Emily Cripps, Baroness Parmoor (née Ellis; 6 January 1878 – 6 July 1952) was a British anti-war activist.

[1] At the time of the Jameson Raid in 1895, she became a secretary to her father, and during the ensuing Second Boer War, she took part in Ruth Fry's projects aimed at helping female victims of the conflict.

In the First World War, the Ellis sisters donated money to the suffering families of conscientious objectors and financed the No Conscription Fellowship.

On 14 July that year, she married politician Charles Cripps, 1st Baron Parmoor, brother-in-law of Lady Courtney and Beatrice Webb.

[1] Two days before her death at her London home, aged 74, she assisted in writing a Quaker message to the prime minister, Winston Churchill, in protest against bombarding North Korea.