DMBA may refer to:
2,4-Dimethoxybenzaldehyde, a reagent used to specifically quantify phlorotannins para-Dimethylaminobenzaldehyde, a reagent used in Ehrlich's reagent and Kovac's reagent 7,12-Dimethylbenz(a)anthracene, an immunosuppressant and powerful laboratory carcinogen 1,3-Dimethylbutylamine, a designer stimulant sometimes found in dietary supplements