Palladium House, formerly known as Ideal House, is a grade II listed Art Deco office building located on the corner of Great Marlborough Street and Argyll Street in London.

The building was designed in by architects Raymond Hood and Gordon Jeeves in the art deco style as the London headquarters of the National Radiator Company (European subsidiary of the American Radiator Company).

Its design was a scaled down version of the American Radiator Building, New York.

[1] Built 1928–9, the building is a seven-storey office block, with black granite facing decorated with an inlaid champlevé design with Egyptian influences.

[1] In 1981, it was declared a Grade II Listed Building.