Mercury House (London building)

Mercury House is an office building at 124, Theobalds Road, Holborn, London, and has been headquarters to Cable & Wireless from 1955. It was opened by John Reith and was named after the Roman god.

The architect was Gordon Jeeves. The interiors were designed by H C Upton, Cable & Wireless's own architect. The three glass panels in the entrance were the work of John Hutton.

Since December 2006 the building is home to MediaCom.