OSRIC, short for Old School Reference and Index Compilation, is a fantasy role-playing game system. It is a remake of the first edition of Advanced Dungeons & Dragons (AD&D), and one of the most successful Dungeons & Dragons retro-clones.^[1]: 366 OSRIC describes itself as "a compilation of rules for old school-style fantasy gaming...intended to reproduce underlying rules used in the late 1970s to early 1980s".^[2] OSRIC uses the Open Gaming License and the System Reference Document of Dungeons & Dragons 3rd edition to create a new presentation of the first edition rule set.

The purpose of OSRIC is to provide publishers with a tool to legally produce gaming materials compatible with first edition AD&D.^[3] More than 20 different publishers have produced more than 500 products branded as OSRIC-compatible.^[4]

The initial version of OSRIC was released in 2006. The OSRIC rules are free to download from the game's site in PDF form.^[5] OSRIC v. 2.0 was released in 2008.^[6] In June 2009, hard copy versions of the rules became available from the Lulu print-on-demand service. Additionally, Black Blade Publishing and Usherwood Publishing together released a deluxe hard-bound print version with extra art and indices not appearing in other editions.

OSRIC v. 2.2, was released in 2013.^[7]