Carbazole 1,9a-dioxygenase (, CARDO) is an enzyme with systematic name 9H-carbazole,NAD(P)H:oxygen oxidoreductase (2,3-hydroxylating). This enzyme catalyses the following chemical reaction

 9H-carbazole + NAD(P)H + H+ + O2  2'-aminobiphenyl-2,3-diol + NAD(P)+

Carbazole 1,9a-dioxygenase catalyses the first reaction in the pathway of carbazole degradation.

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EC 1.14.12