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is a city in Love County, Oklahoma, United States. The population was 2,445 at the 2000 census. It is the county seat of Love County. The city was named after Marietta, Pennsylvania.
According to the United States Census Bureau, the city has a total area of 2.4 square miles (6.2 km²), of which, 2.4 square miles (6.2 km²) of it is land and 0.42% is water.
Marietta is located on State Highway 32 at the junction of US Route 77 and is just east of Interstate 35.