South Euclid is a city in Cuyahoga County, Ohio, United States. It is an inner-ring suburb of Cleveland located on the city's east side. As of the 2020 census, the population was 21,883.

Cuyahoga County is a large urban county located in the northeastern part of the U.S. state of Ohio. The county seat and largest city is Cleveland. As of the 2020 census, its population was 1,264,817, making it the second-most populous county in the state.