The Earl bears the subsidiary titles of Viscount Cranbrook (1878) and Baron Medway (1892), both in the Peerage of the UK.
Earls of Cranbrook (1892) Gathorne Gathorne-Hardy, 1st Earl of Cranbrook (1814-1906) John Stewart Gathorne-Hardy, 2nd Earl of Cranbrook (1839-1911) Gathorne Gathorne-Hardy, 3rd Earl of Cranbrook (1870-1915) John David Gathorne-Hardy, 4th Earl of Cranbrook (1900-1978) Gathorne Gathorne-Hardy, 5th Earl of Cranbrook (b. 1933)
