Cobb County is a county located in the U.S. state of Georgia. Its county seat and largest city is Marietta, which is located in the center of the county. The county was named for Thomas Willis Cobb, who in the early 19th century was a United States representative and senator from Georgia. Marietta was named for his wife, Mary Moore Cobb.

Cobb, along with several other counties in the same bill, was created December 3, 1832, by the Georgia General Assembly from the huge Cherokee "county" territory — land northwest of the Chattahoochee River which the state confiscated from the Cherokee Nation and redistributed to settlers via lottery, following the passage of the federal Indian Removal Act.

As of the 2000 census, the population was 607,751. The county's population has continued to grow. The 2009 estimate from the U.S. Census Bureau was 714,692 people. The county is part of the original and core (five-county) Atlanta metropolitan area, which is included in the Atlanta–Sandy Springs–Marietta, Georgia metropolitan statistical area.

The U.S. Census Bureau ranks Cobb County as the most-educated in the state of Georgia and 15th among all counties in the United States. It is consistently ranked among top 100 wealthiest counties in the United States.

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