Lady Alexandra Margaret Anne Cavendish-Bentinck (6 September 1916 – 29 December 2008) was a member of the British nobility and one of the richest landowners in the country.

Hans Willem Bentinck came to Britain from Holland with William of Orange in 1670 and was created Earl of Portland in 1689.

[1] Anne's paternal grandfather, William Cavendish-Bentinck, 6th Duke of Portland (1857–1943), broke the entail of the family estates and set up a trust ensuring that they and the family seat of Welbeck Abbey went to his eldest granddaughter on the death of her father, thus disinheriting later Bentinck heirs.

[1] As the succession to the Dukedom of Portland was strictly in the male line, Anne's father was succeeded in his titles by his third cousin Ferdinand Cavendish-Bentinck.

When he served as High Sheriff of Nottinghamshire for 2003–2004, The London Gazette gave his address as Welbeck Abbey.

[7] She was described by an employee as "famously forthright, funny and practical, a devastatingly gifted mimic, and would have no truck with pomposity or preciousness."

[6] In the summer of 2000, she went over to the Castle of Mey for tea with her centenarian neighbour and cousin, the Queen Mother, who said after the visit: "She's very gruff.

"[4]Lady Anne's immediate family still ranked quite high, 511th nationally by wealth, per the Sunday Times Rich List in 2008.