Willoughby Hills is a city in Lake County, Ohio, United States, along the Chagrin River.

[6] Willoughby Hills borders Euclid and Richmond Heights on the west, Gates Mills, Highland Heights, and Mayfield Village on the south, Kirtland and Waite Hill on the east, and Wickliffe and Willoughby to the north.

88.3% spoke English, 3.7% Slovene, 3.1% Croatian, 1.1% Spanish, 1.1% Italian, and 1.1% Russian.

[10] Of the city's population over the age of 25, 35.5% held a bachelor's degree or higher.

35.6% of all households were made up of individuals, and 10.8% had someone living alone who was 65 years of age or older.

15.5% were of German, 15.3% Italian, 11.1% Slovene, 8.8% Irish and 7.3% English ancestry according to Census 2000.

The City Council consists of seven members, who are elected for four-year terms.

As of 2024, the members of the City Council are as follows:[13] Two notable buildings in Willoughby Hills are the Squire's Castle in the Cleveland Metroparks' North Chagrin Reservation and the Louis Penfield House, a house designed by Frank Lloyd Wright.