The Marietta Municipal court is an integral part of the state court system in Ohio. The Marietta Municipal Court is located in Washington County, Ohio. It is located within the jurisdiction of the Fourth Appellate District as well as the Supreme Court of Ohio.

Although located in Marietta, the seat of county government, and called the Marietta Municipal Court, it is the only municipal court in Washington County, Ohio and serves the entire county.

The Marietta Municipal Court has a limited jurisdiction in civil disputes. In the general division of the court, jurisdiction is limited to matters in dispute not exceeding $15,000. In the Small Claims division of the court, jurisdiction is limited to matters in dispute not exceeding $6,000.

The Marietta Municipal Court has jurisdiction over both misdemeanor criminal and traffic matters as well as certain stages of felony level offenses. The level of all offenses are defined by statute in Ohio. Generally, a misdemeanor level offense is punishable by a fine not to exceed $1,000 and incarceration in the county jail not to exceed six months. There are several exceptions to the above stated rule. The court conducts all stages of a misdemeanor criminal or traffic proceeding including jury trial and sentencing if there is a conviction. The court's role in felony cases is limited to affording the accused of an initial hearing for the purpose of advising the accused of his/her rights, appointing counsel if necessary, and establishing an appropriate bond to secure release. The court also conducts preliminary hearings in felony matters.