Southgate is a city in Campbell County, Kentucky, United States, a part of metropolitan Cincinnati, Ohio. The population was 3,803 at the 2010 census.

The city of Southgate is named for the family of Richard Southgate. Born in New York City, Richard Southgate came to Newport from Richmond, Virginia in 1795. In October 1797, he was licensed to practice law in the court of Kentucky; appointed Commonwealth Attorney for Campbell County in 1798. He was State Representative in 1803 and Senator from 1817-1821. Richard died in July 1857 at the age of 83. Richard's home still stands on Third Street in Newport, Kentucky. His son William Wright Southgate was a US Congressman from Northern Kentucky.

On May 28, 1977 the Beverly Hills Supper Club in Southgate was engulfed in fire, killing 165 inside.

Southgate is located at 39°3′56″N 84°28′25″W / 39.06556°N 84.47361°W / 39.06556; -84.47361 (39.065611, -84.473638).

According to the United States Census Bureau, the city has a total area of 1.4 square miles (3.6 km²), all land.

Kentucky (ⁱ/kɨnˈtʌki/), officially the Commonwealth of Kentucky, is a state located in the Upper South of the United States. Kentucky is one of four U.S. states constituted as a commonwealth (the others being Virginia, Pennsylvania, and Massachusetts). Originally a part of Virginia, in 1792 Kentucky became the 15th state to join the Union. Kentucky is the 37th most extensive and the 26th most populous of the 50 United States.

Kentucky is known as the "Bluegrass State", a nickname based on the fact that bluegrass is present in many of the pastures throughout the state, because of the fertile soil. It made possible the breeding of high-quality livestock, especially thoroughbred racing horses. It is a land with diverse environments and abundant resources, including the world's longest cave system, Mammoth Cave National Park; the greatest length of navigable waterways and streams in the contiguous United States; and the two largest man-made lakes east of the Mississippi River. It is also home to the highest per capita number of deer and turkey in the United States, the largest free-ranging elk herd east of Montana, and the nation's most productive coalfield. Kentucky is also known for horse racing, bourbon distilleries, bluegrass music, automobile manufacturing, tobacco and college basketball.