Prevotella is a genus of Gram-negative bacteria.
Prevotella spp. are members of the oral and vaginal flora, and are recovered from anaerobic infections of the respiratory tract. These infections include aspiration pneumonia, lung abscess, pulmonary empyema, and chronic otitis media and sinusitis. They have been isolated from abscesses and burns in the vicinity of the mouth, bites, paronychia, urinary tract infection, brain abscesses, osteomyelitis, and bacteremia associated with upper respiratory tract infections. Prevotella spp. predominate in periodontal disease and periodontal abscesses. 
In a study of gut bacteria of children in Burkina Faso (in Africa), Prevotella made up 53% of the gut bacteria, but were absent in age-matched European children. Studies also indicate that long-term diet is strongly associated with the gut microbiome composition—those who eat plenty of protein and animal fats typical of Western diet have predominantly Bacteroides bacteria, while for those who consume more carbohydrates, the Prevotella species dominate.
- Prevotella albensis
- Prevotella brevis
- Prevotella bryantii
- Prevotella copri
- Prevotella intermedia
- Prevotella melaninogenica
- Prevotella nigrescens
- "Bacteroides Infection: Overview - eMedicine". Retrieved 2008-12-11.
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- De Filippo, C.; Cavalieri, D.; Di Paola, M.; Ramazzotti, M.; Poullet, J. B.; Massart, S.; Collini, S.; Pieraccini, G. et al. (2010). "Impact of diet in shaping gut microbiota revealed by a comparative study in children from Europe and rural Africa". Proceedings of the National Academy of Sciences 107 (33): 14691. doi:10.1073/pnas.1005963107.
- Wu GD, Chen J, Hoffmann C, Bittinger K, Chen YY, Keilbaugh SA, Bewtra M, Knights D, Walters WA, Knight R, Sinha R, Gilroy E, Gupta K, Baldassano R, Nessel L, Li H, Bushman FD, Lewis JD (October 7, 2011). "Linking long-term dietary patterns with gut microbial enterotypes". Science 334 (6052): 105–8. doi:10.1126/science.1208344. PMC 3368382. PMID 21885731.
- Jose U Scher, Andrew Sczesnak, Randy S Longman, Nicola Segata, Carles Ubeda, Craig Bielski, Tim Rostron, Vincenzo Cerundolo, Eric G Pamer, Steven B Abramson, Curtis Huttenhower, Dan R Littman (November 5, 2013). "Expansion of intestinal Prevotella copri correlates with enhanced susceptibility to arthritis". eLife 2: e01202. doi:10.7554/eLife.01202.