Azomonas agilis is a species of motile, Gram-negative bacteria found in water and is capable of fixing atmospheric nitrogen.

[1] The species also produces a diffusible yellow-green or red-violet pigment which fluoresces bluish-white under ultraviolet light.

[1] A. agilis was first isolated and described by Martinus Beijerinck in 1901, who obtained the species from Dutch canal water in Delft.

[1] Despite the fact that mannitol was used by Beijerinck in his enrichment medium for A. agilis, the bacteria in pure culture cannot use it as a carbon source unless it is first degraded by other microbes.

[1] The species can tolerate salt concentrations up to 1.0% and is resistant to iodoacetate (1 μM) which suggests it may have ability to live in contaminated waters with relatively high concentrations of organic matter and mineral salts.