Long & Foster (founded 1968) is the largest privately-owned real estate company in the United States with over 15,000 agents in nearly 230 sales offices in the Mid-Atlantic region.

P. Wesley Foster, the chief executive officer and one of the founders, began his real estate career in 1963 as a sales manager at Michew Corporation, a home building company. In 1966, he moved to Nelson Realty as vice-president of sales. In 1968, he founded Long & Foster Companies with Henry Long. Long & Foster began with Foster handling the residential real estate arm of the business and Long handling the commercial side. Foster became the sole owner in July 1979, eleven years after establishing Long & Foster.

Long & Foster has offices and associates in Virginia, Maryland, Washington, D.C., Pennsylvania, New Jersey, West Virginia, Delaware, and North Carolina. It provides services including the sale and purchase of homes, land, and commercial properties; mortgage, title, and insurance assistance; insurance offerings; and relocation and settlement services.