Atopobium is a genus of Actinobacteria, in the family Coriobacteriaceae. Atopobium species are anaerobic bacteria, Gram-positive rod-shaped or elliptical found as single elements or in pairs or short chains. The atopobium vaginae was discovered in 1999 by Rodriguez as a common commensal of the woman's vagina. This is an facultative anaerobic bacteria, Gram-positive rod-shaped or elliptical cocobacilli, which form small colonies on blood agar at 37 °C is also positive for acid phosphatase. It can be identified by 16S ribosomal RNA sequencing, and is associated with bacterial vaginosis.

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