Coomb may refer to:

• Coomb, a rare Celtic Brythonic survival word; meaning a small deep dry valley, easily defended. Deeping Coomb is the name of the fictional well-defended deep valley in The Lord of the Rings. (See: Coombe for a full entry on this primary meaning).
• Coomb, an Saxon quantity, a liquid measurement by volume. Its exact original details are not known. In 13th Century England it was defined as 4 bushels. In use in Norfolk until the 1790s or later, as a dry measure:- "Ben sold my Wheat to the Marlingford Miller this Morning for 19 shillings per Coomb" - Parson Woodforde's Diary, May 20th 1786.
• Brockley Coomb, the title of a poem by
  • British Romantic poet Samuel Taylor Coleridge.
  • British poet Arthur Hugh Clough.
• Coombs test, an aid to medical diagnosis.
• Coomb ceiling, a sloping underside section of a roof or stairwell ceiling.
• Coomb Teak, a medicinal tree (Latin name: 'Gmelina arborea').
• Coomb spores (fictional) are used in an assassination attempt in the Star Wars films.

Places

• Coomb's Cove, Canada.
• Places in England and Ireland:
  • Brockley Coomb, near Bristol.
  • Coomb Valley, North Cornwall.
  • Coomb Bank, Kent
  • Coomb Briggs Wood, Lincolnshire.
  • White Coomb, a mountain in Dumfries and Galloway.
  • Coomb Dodd, South Lanarkshire
  • Coomb Island (Eilean na Coomb).