Butler is a home rule-class city in Pendleton County, Kentucky, in the United States. The population was 612 at the 2010 census.
According to the United States Census Bureau, Butler has a total area of 0.2 square miles (0.52 km2), of which 0.2 square miles (0.52 km2) is land and 4.17% is water.
The city of Butler was established around 1852 when the Kentucky Central Railroad was built through the area. When it was incorporated on February 1, 1868, the city was named for area's earlier U.S. representative William O. Butler.
As of the census of 2000, there were 613 people, 237 households, and 164 families residing in the city. The population density was 2,632.4 people per square mile (1,029.0/km2). There were 268 housing units at an average density of 1,150.9 per square mile (449.9/km2). The racial makeup of the city was 98.69% White, 0.49% African American, 0.16% from other races, and 0.65% from two or more races. Hispanic or Latino of any race were 0.49% of the population.