The Chester Courthouse is a historic courthouse in Chester, Pennsylvania, the former county seat for Chester County, Pennsylvania, one of the three counties in the Province of Pennsylvania laid out by William Penn. It was built in 1724 and is the oldest courthouse still standing in the United States.
Each year in May, during the celebration of Law Day, a special ceremony is held at the Chester Courthouse. Students from the Chester-Upland School District present a mock trial before Judges of the Pennsylvania Court of Common Pleas and the Magisterial District Courts to commemorate the significance of the courthouse and its importance to American jurisprudence.