The Bentinck family is a prominent family belonging to Dutch, German and British nobility. Its members have served in the armed forces and as ambassadors and politicians, including as Governor General of India and as Prime Minister of the United Kingdom. The family is related to the British royal family through the maternal Cavendish-Bentinck line of Queen Elizabeth The Queen Mother.

Earl of Portland is a title that has been created twice in the Peerage of England, firstly in 1633 and secondly in 1689. What proved to be a long co-held title, Duke of Portland, was created in 1716 and became extinct in 1990 upon the death of the ninth Duke, at which point the earldom passed to the most senior agnatic cousin, namely one of the 6th degree.