'''Cực kỳ nguy cấp''' (tiếng Anh: ''Critically Endangered'', viết tắt ''CE'') là một trạng thái bảo tồn của [[sinh vật]] được quy định trong [[Sách đỏ IUCN]]. Một [[loài]] hoặc [[nòi]] được coi là ''Cực kỳ nguy cấp'' khi nó phải đối mặt với nguy cơ tuyệt chủng trong tự nhiên rất cao trong một tương lai rất gần.
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==IUCN Category==
[[Image:Status iucn3.1 CR.svg|thumb|The Critically Endangered status, in relation to other IUCN Red List categories]]
The [[World Conservation Union]] (IUCN), widely considered to be the most objective and authoritative system for classifying species in terms of the risk of extinction,<ref>{{cite web |url=http://www.birdlife.org/action/science/species/global_species_programme/red_list.html |title=Birds on the IUCN Red List |accessdate=2007-02-01 |work=BirdLife International }}</ref> lists 3071 species (1528 animals, 1541 plants, 2 fungi) of the world as being critically endangered in their 2006 [[IUCN Red List|Red List]]. Additionally 254 subspecies or varieties are considered critically endangered, and 30 subpopulations or stocks have been assessed with a critical risk of [[Local extinction|(local) extinction]].
''Critically endangered'' is the highest risk category assigned by the IUCN for wild species. Critically endangered means that a species numbers have decreased, or will decrease, by 80% within three generations.<ref>{{cite web |url=http://news.bbc.co.uk/2/hi/science/nature/4202734.stm |title=Apes extinct in a generation |accessdate=2005-09-01 |work=BBS }}</ref>
As the IUCN does not consider a species extinct until extensive, targeted surveys have been conducted, species which are possibly extinct are still listed as "Critically Endangered". A new category for "[[Possibly Extinct]]" has been suggested by [[BirdLife International]] to categorize these taxa.
