A shared collaboration using head-mounted display is disclosed. Various embodiments are provided for a shared collaboration system and related methods for enabling an active user to interact with one or more additional users and with collaboration items. In one embodiment a head-mounted display device is operatively connected to a computing device that includes a collaboration engine program. The program receives observation information of a physical space from the head-mounted display device along with a collaboration item. The program visually augments an appearance of the physical space as seen through the head-mounted display device to include an active user collaboration item representation of the collaboration item. The program populates the active user collaboration item representation with additional user collaboration item input from an additional user.