A changing-room, locker-room, (usually in a sports, theater, or staff context) or changeroom (regional use) is a room or area designated for changing one's clothes. Changing-rooms are provided in a semi-public situation to enable people to change clothes with varying degrees of privacy.

A fitting room, or dressing room, is a room where people try on clothes, such as in a department store.

Separate changing-rooms may be provided for men and women, or there may be a non-gender-specific open space with individual cubicles or stalls, as with unisex public toilets. Many changing rooms include toilets, sinks and showers. Sometimes a changing room exists as a small portion of a restroom/washroom. For example, the men's and women's washrooms in Toronto's Dundas Square (which includes a water play area) each include a change area which is a blank counter space at the end of a row of sinks. In this case, the facility is primarily a washroom, and its use as a changing room is minimal, since only a small percentage of users change into bathing suits. Sometimes a person may change their clothes in a toilet cubicle of a washroom.

Larger changing rooms are usually found at public beaches, or other bathing areas, where most of the space is for changing, and minimal washroom space is included. Beach-style changing rooms are often large open rooms with benches against the walls. Some do not have a roof, providing just the barrier necessary to prevent people outside from seeing in.