GBLORB is a filename extension associated with interactive adventure game. The format is used by 32-bit virtual machine Glulx, developed by Andrew Plotkin in 1999, which in turn is utilized by Glulxe and Frotz interpreters available for Microsoft Windows systems.

GBLORB is a niche format, rarely used today. However, many FTP servers that distribute games in this format can be found all over the internet, as GBLORB files are used by the community to develop their own adventure games for Glulx.