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)
 
 
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