Viscount Falmouth is a title that has been created twice, first in the Peerage of England, and then in the Peerage of Great Britain. The first creation came in the Peerage of England in 1674 for George FitzRoy, an illegitimate son of King Charles II by Barbara Villiers. He was created Earl of Northumberland at the same time and in 1683 he was made Duke of Northumberland. However, he left no heirs, so the titles became extinct at his death in 1716.