Mac storage basics · Games and virtual machines
Where are Steam games stored on a Mac?
Short answer: In your Library under Application Support → Steam → steamapps. Steam's Storage settings show each game's size and let you uninstall games you've finished.
By default Steam installs games inside your Library: Application Support → Steam → steamapps. That folder can grow very large, and because Library is hidden, it's easy to miss when you look for big files.
The easiest way to see what each game uses is inside Steam itself: its Storage settings list installed games with their sizes and let you uninstall the ones you've finished. Uninstalling removes the game files; your progress usually stays if the game uses cloud saves. To keep games off your internal disk, see moving Steam games to an external drive.