Whitemarsh Island (; ) is an unincorporated community and census-designated place (CDP) in Chatham County, Georgia, United States. The population was 6,983 at the 2020 U.S. census. It is part of the Savannah metropolitan statistical area. The communities of Whitemarsh Island are a relatively affluent suburb of Savannah.
The Whitemarsh Island CDP is located at (32.039482, -81.007850), occupying the island of the same name. It is bordered to the north by Richardson Creek, to the east by Turner Creek, and to the south and west by the Wilmington River, all of which are tidal water bodies. U.S. Route 80 crosses the island, leading west into Savannah and east to Tybee Island on the Atlantic shore. The Islands Expressway runs northwest from Whitemarsh Island to downtown Savannah.
According to the United States Census Bureau, the Whitemarsh Island CDP has a total area of , of which is land and , or 15.10%, is water.
Whitemarsh Island was first listed as a census designated place in the 1990 U.S. census.
As of the 2020 United States census, there were 6,983 people, 2,752 households, and 1,704 families residing in the CDP.
It is in Savannah-Chatham County Public Schools. Schools include:
Live Oak Public Libraries operates the Islands Library.