4 Cowley Street is a Grade II listed house in Westminster, London SW1.

The building was constructed in 1904–1905 by the architect Horace Field as offices for the North Eastern Railway.

[1] English Heritage notes it as having "Lavish late C.17 style, rather out of scale with its neighbours but with fine Arts and Crafts quality of detailing by this early Neo-Georgian revivalist, and no doubt given more importance as it closes the north continuation into Cowley Street of Lord North Street axis.

[2] The building has been restored and refurbished by Saigol DDC as a single family house, rebranded as Mansion House, and is for sale at £36 million.

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