Chelsea Grammar School

The former Chelsea Grammar School is located on Liberty Street in Chelsea, Dutchess County, New York, United States. It is an intact one-room schoolhouse from the late 19th century, when the hamlet was a thriving Hudson River port.

In 1987 it was added to the National Register of Historic Places since it has remained largely intact since its construction. Its use as a school ended in the mid-20th century when the smaller local school districts of the area were consolidated into the Wappingers Central School District. Since then, the local fire department has used half of it as a community center, and the United States Postal Service has leased the other half for use as the local post office, serving the 12512 ZIP Code.