A dormitory or dorm room is on-campus housing for college students, usually referred to as a residence hall. Some large dorm rooms can accommodate two, three, or four students, while others are designed for one person. Some dorm rooms don’t have private bathrooms. Instead, all of the occupants of the rooms in a single hallway have access to one or two shared bathrooms. You can request a private room, but it may not be possible if there are lots of students needing housing.