White mustard (Sinapis alba) is an annual plant of the family Brassicaceae. It is sometimes also referred to as Brassica alba.

Grown for its seeds and as fodder crop or as a green manure, mustard is now wide spread worldwide, although it probably originated in the Mediterranean region.

The yellow flowers of the plant produce hairy seed pods, each containing about half a dozen seeds. These seeds are harvested just before the pods become ripe and burst.

White mustard seeds are hard round seeds, usually around 1 to 1.5 millimeters in diameterwith a color ranging from beige or yellow to light brown.

They can be used whole for pickling or toasted for use in dishes. When ground and mixed with other ingredients, a paste or more standard condiment can be produced.

The seeds have a pungent taste. White mustard with fewer volatile oils is considered to be milder than black mustard.

In Greece, the leaves of the plant leaves are eaten during the winter, before the plant blooms. The blooming season of this plant (February-March) is celebrated with the Mustard Festival.