The Williamsburgh Savings Bank was a financial institution in Brooklyn, New York, from 1851 to 1986. The bank was incorporated in 1851 under legislation passed by the New York State Assembly. The bank continued to operate until a series of mergers brought the bank into the HSBC group late in the 20th century.

Williamsburg is a neighborhood in the New York City borough of Brooklyn, bordered by Greenpoint to the north; Bedford–Stuyvesant to the south; Bushwick and East Williamsburg to the east; and the East River to the west. It was an independent city until 1855, when it was annexed by Brooklyn; around that time, the spelling was changed from Williamsburgh to Williamsburg.