IABC/Chicago is the Chicagoland chapter of the International Association of Business Communicators (IABC). A member of IABC's Pacific Plains Region, Chicago is one of the largest IABC chapters in the U.S., and the oldest chapter in the world. The Chicago chapter was started in 1924 as the Industrial Editors Association of Chicago and later changed its name to the Chicago Association of Business Communicators before becoming IABC/Chicago in January 1980.