The Industry Foundation Classes (IFC) file format is an open, object oriented CAD file format. It is based on a data model developed by buildingSMART International, which was formerly called the International Alliance for Interoperability. It is commonly used format for Building Information Modeling (BIM).

The IFC format was designed to promote interoperability between developers and software programs used in the building industry. Therefore, IFC files are supported by a number of different CAD and 3D design programs.