Old Berkeley County Courthouse, County courthouse in Mount Pleasant, United States.

The Old Berkeley County Courthouse is a two-story, rectangular building of stucco over brick in the Italianate style, with large matching double stairways leading to the main entrance on the second floor. It stands in Mount Pleasant, Charleston County, South Carolina, within the Mount Pleasant Historic District.

The building was constructed in 1884 as the courthouse for Berkeley County but served in this role for only 14 years. When Moncks Corner became the new county seat in 1898, the courthouse functions relocated there.

After losing its court function, the building became a gathering place for Baptist and Lutheran congregations from 1898 to 1968. This religious purpose gave it new meaning in the community's spiritual life.

The building stands within the Mount Pleasant Historic District, near the town's historic core. Visitors reach it on foot or by car; the two-story entrance is up the double stairways, so the main floor is not step-free. Allow time to walk the surrounding streets of the district.

The structure now carries the name G. McGrath Darby Building and received listing on the National Register of Historic Places in 1971. This official recognition marks its importance to the region's heritage.