HMS Badger was a shore establishment of the Royal Navy on the east coast of the United Kingdom. She was commissioned on 13 September 1939 was the flagship of the headquarters of the Flag Officer in Charge (FOIC), Harwich who was responsible to Commander-in-Chief, The Nore, and was decommissioned on 21 October 1946, although the Operations Room remained as the Emergency Port Control for the Harwich area. The site was Parkeston Quay, now Harwich International Port, and the bunker lies under Hamilton House, currently an occupational health centre, close to the entrance to Harwich International Port, a few miles west of Harwich.