Loretto is a home rule-class city in Marion County, Kentucky, United States. The population was 723 at the 2020 census.

Marion County is a county in the U.S. state of Kentucky. As of the 2020 census, the total population was 19,581. Its county seat is Lebanon. The county was founded in 1834 and named for Francis Marion, the American Revolutionary War hero known as the "Swamp Fox".