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 (solely male-line) cousin, namely one of the 6th degree.