The Pseudomonadaceae are a family of bacteria which includes the genera Azomonas, Azorhizophilus, Azotobacter, Mesophilobacter, Pseudomonas (the type genus), and Rugamonas.

The generic name Pseudomonas created for these organisms was defined in rather vague terms in 1894 as a genus of Gram-negative, rod-shaped, and polar-flagellated bacteria.

New methodology and the inclusion of approaches based on the studies of conservative macromolecules have reclassified many species.

Pseudomonas aeruginosa is increasingly recognized as an emerging opportunistic pathogen of clinical relevance.

[3] The presence of oxidase and polar flagella and inability to carry out fermentation differentiate pseudomonads from the Enterobacteriaceae.