New Orleans is world-famous for its abundance of unique architectural styles which reflects the city's historical roots and multicultural heritage. The city has seventeen historic landmark districts, administered by the New Orleans Historic District Landmarks Commission (HDLC). Many styles of housing exist in the city, including the shotgun house (originating from New Orleans) and the bungalow style. Creole townhouses, notable for their large courtyards and intricate iron balconies, line the streets of the French Quarter.

hroughout the city, there are many other historic housing styles:
Creole cottages, American townhouses, double-gallery houses, and Raised Center-Hall Cottages. St. Charles Avenue is famed for its large Antebellum homes and its mansions in various styles such as Greek Revival, Colonial, and Victorian styles such as Queen Anne and Italianate. New Orleans is also noted for its large, European-style Catholic cemeteries, which can be found throughout the city.

For much of its history, New Orleans' skyline consisted of only low-and mid-rise structures. The soft soils of New Orleans are susceptible to subsidence, and there was doubt about the feasibility of constructing large high rises in such an environment. The 1960s brought the World Trade Center New Orleans and Plaza Tower, which demonstrated that high rises could stand firm on New Orleans' soil. One Shell Square took its place as the city's tallest building in 1972. The oil boom of the early 1980s redefined New Orleans' skyline again with the development of the Poydras Street corridor. Today, New Orleans' high rises are clustered along Canal Street and Poydras Street in the Central Business District.