Lyndhurst is a city in Cuyahoga County, Ohio, United States, and an eastern suburb of Cleveland. The population was 14,050 at the 2020 census. A small part of Lyndhurst was originally part of Mayfield Township.

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.