Forgotten Realms: Unlimited Adventures, also known as Unlimited Adventures, or by the acronyms FRUA or UA, is a video game originally released on March 17, 1993, by Strategic Simulations, for the IBM PC and Macintosh.

Unlimited Adventures is a construction kit for computer role-playing games, and drew its content from the prior Gold Box engine games, with improved graphics. SSI's contract with TSR, Inc. required the former to stop using the Gold Box engine, so the company released its development tools. Games created by users can be shared with other players who also own Unlimited Adventures. As of 2022, the program still has an active community of users.

The original game allowed the user to create dungeon modules, some editing and renaming of monsters and characters, and to import pictures and monster sprites. However, some art, such as walls, combat backdrops, and title screens, could not be changed in the unmodified game.

Those limitations have been overcome by community-made mods. The availability of these mods has led to the creation of comprehensive "worldhacks", designed to allow the creation of science fiction, superhero, Western and Roman Empire adventures, among others. A program called "UASHELL" applies and manages these hacks and enables the player to apply them.

The fanmade game design program Dungeon Craft (originally called UA Forever) is a standalone program that partially emulates FRUA's engine, but with a greater ease of user modification.