Translation guide
A room with lockers for changing clothes and storing belongings, typically in a gym, school, or sports facility.
A room in a gym, pool, or sports facility where people change clothes and store items in lockers.
The most common and general term for a locker room or changing room. Used in gyms, pools, schools, and workplaces.
I changed in the gym locker room.
Literally 'place to undress', used for changing rooms in public baths (銭湯) or hot springs (温泉). Not typically used for gym locker rooms.
There are lockers in the locker room.
A loanword from English, often used in sports or fitness contexts. Sounds slightly more casual or modern.
I change into my uniform in the locker room.
温泉の脱衣所で服を脱いだ。
I took off my clothes in the hot spring changing room.