Peconic may refer to:
Peconic, New York, a hamlet in Suffolk County, New York Peconic Bay, two bodies of water between the North Fork and the South Fork of Long Island, New York Great Peconic Bay, the body of water between the North Fork and the South Fork of Long Island, New York Little Peconic Bay Peconic Bay Medical Center, in Riverhead, New York Peconic County, New York, a proposed new county in New York Peconic River, a tributary of Peconic Bay in Suffolk County, New York USS Peconic (AOG-68), a United States Navy ship