Lennar Corporation is an American home construction company based in Miami-Dade County, Florida. As of 2025, it is the second-largest home construction company in the United States based on the number of homes sold. Lennar has investments in multifamily and single-family residential rental properties, luxury development, property technology with LenX, and mortgage lending from Lennar Mortgage.

With a total annual revenue of over $35 billion in 2024, Lennar operates in 30 states and 75 markets nationwide. In 2023, the company was ranked 119th on the Fortune 500. Lennar stock (LEN) was added to the New York Stock Exchange in 1982 and as of 2024 has a market cap of around $47 billion.

The name Lennar is a portmanteau of the first names of two of the company's founders, Leonard Miller and Arnold Rosen.

Lennar dates back to F&R Builders, a company founded in 1954 by Gene Fisher and real estate developer Arnold P. Rosen. In 1956, Leonard Miller, who later became the namesake of the Miller School of Medicine at the University of Miami, a 23-year-old entrepreneur that owned 42 lots in Miami-Dade County, Florida, invested $10,000 and partnered with the company.

In 1969, Lennar reached an equity base of $1 million, and by 1971, Miller and Rosen changed the name to Lennar Corporation. That year the firm became a public company via an initial public offering, raising $8.7 million. It was listed on the New York Stock Exchange in 1972.

In 1973, the company acquired Mastercraft Homes, based in Phoenix, Arizona, for approximately $2 million, as well as the Womack Development Company. Shortly thereafter, the company established operations in the Midwestern United States, purchasing Bert L. Smokler & Company, based in Detroit, Michigan, and Dreyfus Interstate Development Corp., based in Minneapolis–Saint Paul.

Lennar acquired H. Miller & Sons in 1984 for $24 million.

In January 1989, the company acquired Richmond American Homes of Florida for $18 million.