Aspergillus ambiguus is a species of fungus in the genus Aspergillus. It is from the Terrei section. The species was first described in 1955. It has been reported to produce a butyrolactone and terrequinone A.
A. ambiguus has been cultivated on both Czapek yeast extract agar (CYA) plates and Malt Extract Agar Oxoidî (MEAOX) plates. The growth morphology of the colonies can be seen in the pictures below.