"Slifer vs. Obelisk!", titled "Osiris VS Obelisk!!" (神VS神!! Oshirisu Bāsasu Oberisuku!!) in the Japanese version, is the twenty-ninth volume of the Yu-Gi-Oh! manga. The kanji in the Japanese name, 神VS神!!, is normally read as Kami Tai Kami!!, meaning "God VS God!!", while the furigana, オシリスバーサスオベリスク!!, makes it Oshirisu Bāsasu Oberisuku!!, meaning "Osiris vs Obelisk!!".
In its first English printing, it was numbered as the twenty-second volume of Yu-Gi-Oh! Duelist. In the 3-in-1 edition, its number was changed to match the original Japanese printing.