The title Viscount Falmouth has been created twice, first in the Peerage of England, and then in the Peerage of Great Britain. George Fitzroy was the beneficiary of the first creation; he was later made Duke of Northumberland, but he left no heirs, so his title became extinct at his death.

The second creation was in favour of Hugh Boscawen in 1720. The fourth Viscount was created Earl of Falmouth, but the earldom became extinct upon the death of the second Earl. The seventh Viscount succeeded to the ancient title of Baron le Despencer.

Viscounts Falmouth, First Creation (1674)

• George Fitzroy, 1st Duke of Northumberland (1665-1716)

Viscounts Falmouth, Second Creation (1720)

• Hugh Boscawen, 1st Viscount Falmouth (c. 1680-1734)
• Hugh Boscawen, 2nd Viscount Falmouth (1707-1782)
• George Evelyn Boscawen, 3rd Viscount Falmouth (1758-1808)
• Edward Boscawen, 1st Earl of Falmouth (1811-1852)
• George Henry Boscawen, 2nd Earl of Falmouth (1811-1852)
• Evelyn Boscawen, 6th Viscount Falmouth (1819-1889)
• Evelyn Edward Thomas Boscawen, 7th Viscount Falmouth (1847-1918)
• Evelyn Hugh John Boscawen, 8th Viscount Falmouth (1887-1962)
• George Hugh Boscawen, 9th Viscount Falmouth (b. 1919)