Ruth Mary Clarisse Cholmondeley, Lady Delamere (née Ashley, formerly Cunningham-Reid and Gardner; 22 July 1906 – 10 October 1986), was a British heiress and socialite.

A granddaughter of German-Jewish banker Sir Ernest Cassel, she inherited an estate including a large manor house in Six Mile Bottom and half of her grandfather's fortune (valued at approximately £50 million in 2020).

[3] Lady Delamere's paternal grandfather, Evelyn Ashley, was Under-Secretary of State for the Colonies, a Member of Parliament, and the younger son of Anthony Ashley-Cooper, 7th Earl of Shaftesbury.

[3] In 1921, Lady Delamere's grandfather, Sir Ernest Cassel, died, leaving her sister and her the majority of his estate (worth around £50 million in 2020).

[4] On their honeymoon, she insisted that they share her wealth because "no decent woman likes to have a man live with her in charity", but when they divorced in 1940, Cunningham-Reid sued for half of her $400,000 annual income.