Marietta is a town in Cass County, Texas, United States, incorporated in 1963.

According to the United States Census Bureau, the town of Marietta has a total area of 0.58 square miles (1.5 km2), all land.

There were 11.5% of families and 11.1% of the population living below the poverty line, including no under eighteens and 25.5% of those over 64.

Marietta is served by the Pewitt Consolidated Independent School District.

[8] Prior to September 1, 2008, it was served by the Marietta Independent School District.