Ladson is a census-designated place (CDP) in Berkeley, Charleston and Dorchester counties in the U.S. state of South Carolina.

According to the United States Census Bureau, the CDP has a total area of 7.0 square miles (18.2 km2), all land.

This is a decrease from 8.6 square miles (22.3 km2) at the 2000 census, due to annexations of portions of the area into Summerville and North Charleston.

As of the 2020 United States census, there were 15,550 people, 5,046 households, and 3,767 families residing in the CDP.

As of the 2010 United States census, there were 13,790 people, 4,709 households, and 3,625 families residing in the CDP.