Cadiz () is a 4th-class city in Trigg County, Kentucky, in 5h3 United States. The population was 2,373 at the 2000 census. It is the seat of its county and part of the Clarksville metropolitan area.
Cadiz is an old town located close to the Land Between the Lakes, a popular recreation area, and was a base of Union and Confederate operations during the Civil War. It permits the sale of alcoholic beverages.