The Acura ILX is a compact car (C-segment) manufactured and marketed by Honda under the Acura brand, based on the ninth-generation Civic sedan. The ILX replaced the Canadian market exclusive Acura CSX. The gasoline-electric hybrid version was Acura's first.

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.