|Location||Goldshire, Elwynn Forest|
|Relative(s)||Morgan and Supply Officer Pestle (brothers)|
William Pestle is a level 6 human quest giver located in the Lion's Pride Inn in Goldshire in Elwynn Forest. He and his brother Morgan Pestle run the apothecary in the Trade District of Stormwind City. He uses his skills as an alchemist to create an so that Maybell Maclure can secretly visit her love, Tommy Joe Stonefield without their feuding families finding out. He is an old friend of Mildred Stonefield.
Jimb "Candles" McHannigan claims that he was William's number-one supplier of candles.
Aha! Good day, good day, Master <class>! Come, sit down and have a drink. You have an enterprising look in your eye, and I think you'll find speaking to me worth your time...
- His last name is a reference to a mortar and pestle, an alchemical device used by apothecaries to grind substances or ingredients.