The C-segment is the 3rd category of the European segments for passenger cars and is described as "medium cars". It is equivalent to the Euro NCAP "small family car" size class, and the compact car category in the United States.

Compact car is a vehicle size class—predominantly used in North America—that sits between subcompact cars and mid-size cars. "Small family car" is a British term and a part of the C-segment in the European car classification. However, before the downsizing of the United States car industry in the 1970s and 1980s, larger vehicles with wheelbases up to 110 in (2.79 m) were considered "compact cars" in the United States.