Food and plants
* Mustard (condiment), a paste or sauce made from mustard seeds used as a condiment * Mustard plant, one of several plants, having seeds that are used for the condiment ** Mustard seed, small, round seeds of the mustard plant used in cooking * Mustard greens (''Brassica juncea''), edible leaves from a variety of mustard plant * Mustard oil * Mustard family, or Brassicaceae, a family of plants * Mustard tree, or ''Salvadora persica'' * Betel vine, produces the fresh fruit mustard stick * Tomalley, sometimes called the "mustard" of a crab or lobsterScience and technology
* Mustard (color), a dull/dark shade of yellow, similar to the color of the condiment * BAC Mustard (Multi-Unit Space Transport and Recovery Device), an experimental British spacecraft * Mustard gas or sulfur mustard, a chemical weapon * Nitrogen mustard, chemotherapy agents derived from mustard gasOther uses
* Mustard (name), including a list of people with the name * ''Mustard'' (album), by English musician Roy Wood * Colonel Mustard, a character in the board game ''Cluedo,'' otherwise known as ''Clue'' * Mustard (''My Hero Academia''), a character in the manga series ''My Hero Academia'' * Tomislav Tomašević, the popular nickname of the Zagreb city mayor * Parable of the Mustard Seed, a parable told by Jesus of Nazareth * The Mustard Seed (restaurant), an Irish restaurant located in Ballingarry, County Limerick * " Mean Mr. Mustard", a song featured on the 1969 album ''Abbey Road'' by English rock band the BeatlesSee also
* Mustard plaster, a traditional medical treatment used to treat minor ailments, made from mustard seed powder * Garden cress, also referred to as mustard and cress, an edible herb used as a filling or garnish for a variety of dishes * The Mustard Seed (disambiguation) {{disambiguation, plant