The National Association of Realtors (NAR) is an American trade association for those who work in the real estate industry. As of December 2023, it had over 1.5 million members, making it the largest trade association in the United States including NAR's institutes, societies, and councils, involved in all aspects of the residential and commercial real estate industries. The organization holds a U.S. trademark over the term "Realtor". NAR also functions as a self-regulatory organization for real estate brokerage. The organization is headquartered in Chicago.

Real estate is property consisting of land and the buildings on it, along with its natural resources such as growing crops, minerals or water, and wild animals; immovable property of this nature; an interest vested in this (also) an item of real property, buildings or housing in general. In terms of law, real relates to land property and is different from personal property while estate means the "interest" a person has in that land property.