Emily Theresa Russell, Baroness Ampthill,[1] VA (9 September 1843 – 22 February 1927) was a British courtier.

Born Lady Emily Theresa Villiers, she was the third daughter of George Villiers, 4th Earl of Clarendon and his wife, Katherine (née Grimston, formerly Foster-Barham), eldest daughter of James Grimston, 1st Earl of Verulam.

She was a bridesmaid to Princess Alexandra of Denmark on the latter's marriage to the Edward, Prince of Wales in 1863.

On 5 May 1868, she married Odo Russell (son of Lord George Russell) at Watford and they had six children: In 1881, Odo was created Baron Ampthill.

In 1897, she was one of the guests at the Duchess of Devonshire’s Diamond Jubilee Costume Ball.