Baktéríà ( [bækˈtɪərɪə] (ìrànwọ́·info); ìkan: Bakterio) je idipo ninla awon ohun elemintintinni prokarioti ti won ni ahamo eyokan. Gigun won je mitatintinni, idasi bakteria je orisirisi, lati roboto de opa de ilo. Bakteria wa nibi gbogbo ni ile-aye, won wu ninu erupe, omi kikan gbigbona, idoti,omi, ati jinjin ninu ile aye, bakanna ninu elo elemin, ati ninu ara awon ogbin ati eranko. 40 legbegberun ahamo bakteria ninu erupe gramu kan be sini egbegberun kan ahamo bakteria lo wa ninu omi; lapapo egbegberunkesan marun (5×1030) bakteria lowa ni aye ti won sedajo opo isupoalaaye ni agbaye. "Bacteria (eubacteria)". Taxonomy Browser. NCBI. Retrieved 2008-09-10.  Fredrickson JK, Zachara JM, Balkwill DL, et al. (July 2004). "Geomicrobiology of high-level nuclear waste-contaminated vadose sediments at the Hanford site, Washington state". Applied and Environmental Microbiology 70 (7): 4230–41. doi:10.1128/AEM.70.7.4230-4241.2004. PMC 444790. PMID 15240306. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=444790.  Whitman WB, Coleman DC, Wiebe WJ (June 1998). "Prokaryotes: the unseen majority".