VFS is GNU Smalltalk's Virtual FileSystem layer. VFS allows GNU Smalltalk programs to use archive files (.gz, .tar, .zip, etc.) and URLs transparently.

VFS is inspired by the homonymous feature of the Midnight Commander, later incorporated in GNOME. Currently, VFS is not compatible with the GNOME VFS, but it might become in the future.

VFS is a fundamental part of the implementation of .star packages.