The Happy Mask Salesman (お面屋 Omen'ya?, Mask Shop Owner) is a mysterious man who specialises in masks, which Link can use for different purposes. He is almost always happy, with few exceptions. He first appears in Ocarina of Time. He is found in his Happy Mask Shop located in Hyrule Castle town during Link's childhood.

At the shop, Link can borrow masks to sell to people around Hyrule. If Link returns without enough Rupees to repay the Happy Mask Salesman, he will become enraged and kick Link out of the shop. Once Link sells all the masks, he may borrow any of them, as well as a few extras, which are used merely for humorous purposes. The exception is the Mask of Truth, which Link can use to talk to Gossip Stones.