Wilder is a home rule-class city in Campbell County, Kentucky, United States. The population was 3,035 at the 2010 census. It is part of the Cincinnati-Northern Kentucky metropolitan area.
Wilder is located at 39°2′50″N 84°28′39″W (39.047304, −84.477377).
According to the United States Census Bureau, the city has a total area of 3.8 square miles (9.8 km2), of which 3.7 square miles (9.6 km2) is land and 0.1 square miles (0.26 km2) (2.89%) is water.
Wilder was once known as Leitch's Station. It was the first settlement in Campbell County. The name Wilder dates back to a railroad station built in the mid-19th century for the Louisville, Cincinnati and Lexington Railway named Wilder station. "Wilder Station" is now located on property owned by Newport Steel. It is the home of supposed ghostly hauntings at the country music nightclub and honky tonk, Bobby Mackey's Music World, which has been called "the most haunted nightclub in America".
As of the census of 2000, there were 2,624 people, 1,162 households, and 743 families residing in the city.