In the Pathfinder rules here's what it says:
If a rogue can catch an opponent when he is unable to defend himself
effectively from her attack, she can strike a vital spot for extra
damage.The rogue's attack deals extra damage anytime her target would be
denied a Dexterity bonus to AC (whether the target actually has a
Dexterity bonus or not), or when the rogue flanks her target. This
extra damage is 1d6 at 1st level, and increases by 1d6 every two rogue
levels thereafter. Should the rogue score a critical hit with a sneak
attack, this extra damage is not multiplied. Ranged attacks can count
as sneak attacks only if the target is within 30 feet.
I just wanted to confirm, it seems as though a rogue who gets an Attack of Opportunity while flanking would get his sneak attack damage.
Am I mistaken?
Best Answer
Yes
An AoO while flanking is an attack while flanking, so it meets the condition and does get the bonus damage. In this context, it being an AoO doesn't change anything.