The Italianate style was a distinct 19th-century phase in the history of Classical architecture. Like Palladianism and Neoclassicism, the Italianate style drew its inspiration from the models and architectural vocabulary of 16th-century Italian Renaissance architecture, synthesising these with picturesque aesthetics. The style of architecture that was thus created, though also characterised as "Neo-Renaissance", was essentially of its own time. "The backward look transforms its object," Siegfried Giedion wrote of historicist architectural styles; "every spectator at every period—at every moment, indeed—inevitably transforms the past according to his own nature."

The Italianate style was first developed in Britain in about 1802 by John Nash, with the construction of Cronkhill in Shropshire. This small country house is generally accepted to be the first Italianate villa in England, from which is derived the Italianate architecture of the late Regency and early Victorian eras. The Italianate style was further developed and popularised by the architect Sir Charles Barry in the 1830s. Barry's Italianate style (occasionally termed "Barryesque") drew heavily for its motifs on the buildings of the Italian Renaissance, though sometimes at odds with Nash's semi-rustic Italianate villas.

The style was not confined to England and was employed in varying forms, long after its decline in popularity in Britain, throughout Northern Europe and the British Empire. From the late 1840s to 1890 it achieved huge popularity in the United States, where it was promoted by the architect Alexander Jackson Davis.