Sir Sebastian Harvey (died 21 February 1621) was an English merchant who was Lord Mayor of London in 1618.
[1] He became a city of London merchant and a member of the Worshipful Company of Ironmongers.
On 14 March 1609, he was elected an alderman of the City of London for Billingsgate ward.
He was Sheriff of London for the years 1609 to 1610.
In 1618 he was elected Lord Mayor of London.