Viscount Sydney (an alternative spelling of the surname Sidney) is a title that has been created twice. The title was elevated twice from a barony, and once into an earldom.

First creation (1689)

thumb|200px|Henry Sydney, Earl of Romney

The first creation came on 9 April 1689 when Henry Sydney was elevated from Baron Sydney to Viscount Sydney, of Sheppey, in the Peerage of England. On 14 May 1694, he was also created Earl of Romney