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- Obsidian Fate (Buffy novel)
- "Offspring" (Angel episode)
- Old Friends (Angel comic)
- Old Ones (Buffy the Vampire Slayer)
- "Older and Far Away" (Buffy the Vampire Slayer episode)
- "Once More, with Feeling" (Buffy the Vampire Slayer episode)
- "Origin" (Angel episode)
- The Origin (Buffy comic)
- "Orpheus" (Angel episode)
- "Out of Mind, Out of Sight" (Buffy the Vampire Slayer episode)
- "Out of My Mind" (Buffy the Vampire Slayer episode)
- Out of the Woodwork (Buffy comic)
- "Over the Rainbow" (Angel episode)
- Oz (Buffy comic)
- Oz (Buffy the Vampire Slayer)
- Oz: Into the Wild (Buffy novel)
Read more about this topic: Index Of Articles Related To Buffy The Vampire Slayer