Cloacibacterium normanense is a bacterium originally found in wastewater in Norman, Oklahoma. It is Gram-negative, non-motile, and facultatively anaerobic. Physically, it is a rod-shaped organism with yellow pigmentation.

This organism was discovered^{[ when?]} using a non-selective medium, as opposed to the traditional selective media often used to isolate microorganisms. In this case, the method involved diluting raw sewage.

• Allen, Toby D.; et al. (2006). "Cloacibacterium normanense gen. nov., sp. nov., a novel bacterium in the family Flavobacteriaceae isolated from municipal wastewater". International Journal of Systematic and Evolutionary Microbiology. 56 (Pt 6): 1311–1316. doi: 10.1099/ijs.0.64218-0. PMID  16738108.
• Peterson, Althea (2006-06-17). "Tiny discovery made in Norman". The Norman Transcript. Retrieved 9 February 2016.