The architecture of the United States demonstrates a broad variety of architectural styles and built forms over the country's history of over two centuries of independence and former Spanish, French, Dutch and British rule.

Architecture in the United States has been shaped by many internal and external factors and regional distinctions. As a whole it represents a rich eclectic and innovative tradition.

The oldest surviving non-imported structures on the territory that is now known as the United States were made by the Ancient Pueblo People of the four corners region. The Tiwa speaking people have inhabited Taos Pueblo continuously for over 1000 years. Algonquian villages Pomeiooc and Section in what later became coastal North Carolina survive from the late 16th century. Artist and cartographer John White stayed at the short-lived Roanoke Colony for 13 months and recorded over 70 watercolor images of indigenous people, plants, and animals.

The remote location of the Hawaiian Islands from North America gave ancient Hawaii a substantial period of precolonial architecture. Early structures reflect Polynesian heritage and the refined culture of Hawaii. Post-contact late-19th-century Hawaiian architecture shows various foreign influences such as the Victorian, Georgian, and early-20th-century Spanish Colonial Revival styles.

When the Europeans settled in North America, they brought their architectural traditions and construction techniques for building. The oldest buildings in America have examples of that. Construction was dependent on the available resources. Wood and brick are the most common elements of English buildings in New England, the Mid-Atlantic, and the coastal South. It had also brought the conquest, destruction, and displacement of the indigenous peoples existing buildings in their homeland, as their dwelling and settlement construction techniques devalued compared to colonial standards. The colonizers appropriated the territories and sites for new forts, dwellings, missions, churches, and agricultural developments.

The Spanish colonial architecture in the United States was markedly different from the European styles adopted in other parts of America such as the simple French colonial houses in the Mississippi Valley, which were consisted of adjoining rooms that opened upon a galerie. The Spanish architecture (particularly evident in ecclesiastical establishments) built in the states of Texas, New Mexico, Arizona, California, Florida, and Georgia was similar to the design adopted in Mexico. According to scholars, the Spaniards built without any consideration to the cost, believing that their tenure in America would be eternal.

Spanish colonial architecture was built in Florida and the Southeastern United States from 1559 to 1821. The conch style is represented in Pensacola, Florida and other areas of Florida, adorning houses with balconies of wrought iron, as appears in the mostly Spanish-built French Quarter of New Orleans, Louisiana. Fires in 1788 and 1794 destroyed the original French structures in New Orleans. Many of the city's present buildings date to late-18th-century rebuilding efforts.

The two earliest continuously occupied European settlements in the United States are St. Augustine, Florida founded in 1565 and Santa Fe, New Mexico. St. Augustine, the first continuously European-occupied city in North America, was established in 1565. Beginning in 1598, quarried coquina from Anastasia Island contributed to a new colonial style of architecture in this city. Coquina is a limestone conglomerate, containing small shells of mollusks. It was used in the construction of residential homes, the City Gate, the Cathedral Basilica, the Castillo de San Marcos, and Fort Matanzas. The city of St. Augustine is one of the rare vestiges of 17th-century Spanish colonial architecture in the present day United States.