- "This is a repair part for a B3. Whatever happened here, it's recent."
- ―Quinlan Vos
B3 battle droids were battle droids manufactured by Baktoid Combat Automata and used by the Confederacy of Independent Systems during the Clone Wars. B2 super battle droids and B3 battle droids were favored over the expensive and complex E522 assassin droids. At one point, at least one was stationed near a listening post on the planet Vanqor. A curved piece of metal used in B3 repair was uncovered by Quinlan Vos when he and a Republic strike team attacked the listening post.
- Cyphers and Masks (First identified as B3 battle droid)