OSR stands for "Old School Renaissance." It is an umbrella term encompassing pre-D&D 3.0 versions of Dungeons & Dragons. The various older editions are closely related enough that an answer for one is often applicable to other editions.

This encompasses the following:

  • Original Dungeons & Dragons [odnd]
  • Basic Dungeons & Dragons (Holmes) [dnd-holmes]
  • B/X Dungeons & Dragons (Moldvay/Cook) [dnd-bx]
  • BECMI Dungeons & Dragons (Mentzer) [dnd-becmi]
  • Advanced Dungeons & Dragons 1st Edition (Gygax) [adnd]
  • Advanced Dungeons & Dragons 2nd Edition (Cook) [adnd-2e]

Many reissues of the first rules (pre ADnD) also exist and are classified as OSR too. This includes (alphabetical list, non comprehensive):

  • Labyrinth Lord
  • Swords and Wizardry
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