Grey box

Grey or gray box may refer to:

Science and technology

 * Gray box testing, software testing
 * Grey box model, in mathematics, statistics, and computational modelling
 * Grey identification method, used in system identification

Botany

 * Jojoba (Simmondsia chinensis), also known as gray box bush

Eucalyptus

 * Grey box, many trees in the genus Eucalyptus, native to Australia, including:
 * Eucalyptus argillacea (Kimberley grey box or northern grey box)
 * Eucalyptus bosistoana (coast grey box or Gippsland grey box)
 * Eucalyptus brownii (grey box)
 * Eucalyptus hemiphloia (grey box); See Eucalyptus albens
 * Eucalyptus largeana (grey box)
 * Eucalyptus microcarpa (grey box, inland grey box or western grey box)
 * Eucalyptus moluccana (grey box or coastal grey box)
 * Eucalyptus normantonensis (grey box)
 * Eucalyptus pilligaensis (narrow-leaved grey box, pilliga grey box)
 * Eucalyptus quadrangulata (grey box)
 * Eucalyptus rummeryi (grey box)
 * Eucalyptus tectifica (grey box)