WBFS is a file extension used for game image files. WBFS file stores copy of video game for Wii game console developed by Nintendo. Game copies can be made using Wiimms ISO Tools application and saved on SD card or USB drive.

WBFS is also the name of a system file format that is used to store WFBS files. WBFS game image files can be used to run games on different systems using various Wii emulators. WBFS files can also be converted into ISO files.