Below is a complete listing of items that appear in Majora's Mask.
All-Night Mask
Blast Mask
Bremen Mask
Bunny Hood
Captain's Hat
Couple's Mask
Deku Mask
Don Gero's Mask
Fierce Deity's Mask
Garo's Mask
Giant's Mask
Gibdo Mask
Big Poe
Blue Potion
Mystery Milk
Bugs
Chateau Romani
Deku Princess
Fairy
Fish
Gold Dust
Green Potion
Hot Spring Water
Magic Mushroom
Milk
Milk (1/2)
Poe Soul
Red Potion
Seahorse
Spring Water
Zora Egg