Se determinó la carga microbiológica de Hierbas Medicinales que se expenden en la ciudad de Santa Fe, los microorganismos viables fueron caracterizados fenotípicamente y se identificaron las especies de Aspergillus. Malva, Poleo, Ruda, Estigma de Maíz, Boldo, Manzanilla y Menta fueron obtenidas, al azar, de diferentes farmacias. Los recuentos microbiológicos, en superficie, para las bacterias mesófilas totales oscilaron entre 2x103 y 5,3x106 UFC/g de muestra y para hongos, los valores mínimos y máximos fueron 0 y 1,5x106 UFC/g. Se identificaron siete especies diferentes de Aspergillus y una de Eurotium. Existió gran variabilidad en la carga microbiana y tipo de microorganismos presentes; los hongos hallados, por su potencial capacidad toxicogénica, podrían representar un peligro para la salud, aún con recuentos dentro de los límites permitidos.Microbiological load of medicinal plants expended in Santa Fe city (Argentina) was determined, viable microorganisms were phenotypically characterized and Aspergillus species were identified. Mallow, poleo, ruda, corn stigma, boldo, chamomile and mint were randomly obtained from different pharmacies. Microbiological surface counts were carried out. Total aerobic mesophilic bacteria results were between 2x103 and 5.3x106 CFU/g of sample, and for fungi, minimum and maximum values were 0 and 1.5x106 CFU/g, respectively. Seven different Aspergillus species and one Eurotium specie were identified. Great variability in microbial load and microorganisms, were detected; potential toxicogenic Aspergillus species identified could represent a high risk for human health, even when their concentration are under allowed limits.