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is a city in McIntosh County, Oklahoma, United States. The population was 2,639 at the 2000 census. It is the county seat of McIntosh County.
According to the United States Census Bureau, the city has a total area of 9.6 square miles (24.9 km²), of which, 6.6 square miles (17.2 km²) of it is land and 3.0 square miles (7.8 km²) of it (31.15%) is water.
Eufaula is home to Lake Eufaula, the largest lake contained entirely within the state of Oklahoma because of the Eufaula Dam. Also Lake Eufaula contains Standing Rock a historical monument which can not be seen anymore since the creation of the lake.