Essex County may refer to:
Canada
- Essex County, Ontario
United Kingdom
- Essex, the original county in England
United States of America
- Essex County, Massachusetts
- Essex County, New Jersey, the most populous Essex County in the country
- Essex County, New York
- Essex County, Vermont
- Essex County, Virginia
Other uses
- Essex County Trilogy, a trilogy of graphic novels by Jeff Lemire
- Essex County (TV series), a television drama series adapted from the graphic novel