Caroline Alice Margaret Douglas, Dowager Marchioness of Queensberry (née Clayton; 13 July 1821 – 14 February 1904) was an Anglo-Irish peer and Irish nationalist benefactor.
Her mother, Alice Clayton (born O'Donnell), was from County Mayo, and was a Roman Catholic, but despite this the couple's four children were raised as Anglicans.
Falconer Atlee, the British Consul at Nantes, offered them a place of safety when their first location was discovered, and the Emperor Napoleon III eventually extended Lady Queensberry his protection, ensuring that she could keep the custody of the three children.
In 1867 she caused a scandal in London society by raising money towards the defence of the Manchester Martyrs, writing to all three men while they were in prison and sending a cheque for £100 to help to support their dependents.
She continued to support Irish nationalism, regardless of the cold reception she received in English society because of it, and wrote pamphlets on the subject, including Let there be light (1867).
In fact, she lived in Boulogne on a small annuity bequeathed to her by her father, but was at Glen Stuart, Annan, Dumfries and Galloway when she died on 14 February 1904.