One Great George Street (OGGS) is a four-domed grade II listed Edwardian building used as a conference and wedding venue just off Parliament Square in Westminster, England. The building is the global headquarters of the Institution of Civil Engineers (ICE); it was originally solely a venue for ICE members to meet informally and for conferences, but became available for public events in 1989. It is near the Houses of Parliament, Westminster Abbey, and St James's Park.