* '''RtM''' - Read the Manual. What no one ever actually does.

* '''roll''' - The random array of affixes on an item. The occasional item with good mods is said to have "a good roll." See [[RNG]] and [[drop]].

* '''RoT''' - [[Rain of Toads]] a Witch Doctor skill.

* '''[[Rubber band]]''' - Often cited as "Rubberbanding." The result of a desynch between the server and the client, where a character or monster appears to have moved, only to suddenly bounce back to the previous location when the server corrects the location. A source of great player frustration, most often seen in Diablo 3 with fast movement skills such as [[Furious Charge]] or [[Tempest Rush]].