Marconi House is a Grade II listed building at 335 Strand (at its junction with Aldwych) in London. It was originally built as a hotel and restaurant in 1904, designed by Norman Shaw, to serve the Gaiety Theatre next door. It then became the headquarters of the Marconi Companies from the week of May 12, 1912 to 1933 and later as the offices of English Electric. The building has since been converted for residential use by Galliard Homes.