Baron Plunket, of Newtown in the County of Cork,[2] is a title in the Peerage of the United Kingdom.

It was created in 1827 for the prominent Irish lawyer and Whig politician William Plunket.

His grandson, Patrick, the seventh Baron, was Equerry to both King George VI and Queen Elizabeth II.

Their mother, the wife of the sixth baron, was the illegitimate daughter of the actress Fannie Ward and The 7th Marquess of Londonderry.

After the sixth baron and his wife were killed in an air accident in 1938, the three Plunket brothers were raised by an aunt and uncle.