Gardnerellaspp. are associated with bacterial vaginosis, in which normally dominant lactobacilli are replaced with facultative and anaerobic bacteria includingGardnerellaspp. Co-occurrence of multiple species ofGardnerellais common in the vagina and competition for nutrients such as glycogen likely contributes to the differential abundances ofGardnerellaspp. Glycogen must be digested into smaller components for uptake; a process that depends on the combined action of enzymes collectively known as amylases. In this study, the ability of culture supernatants of 15 isolates ofGardnerellaspp. to produce glucose, maltose, maltotriose and maltotetraose from glycogen was demonstrated. Carbohydrate active enzymes were identified bioinformatically inGardnerellaproteomes using dbCAN2. Identified proteins included a single domain α-amylase (encoded by all 15 isolates) and an α-amylase-pullulanase containing amylase, carbohydrate binding modules and pullulanase domains (14/15 isolates). To verify the sequence-based functional predictions, the amylase and pullulanase domains of the α-amylase-pullulanase, and the single domain α-amylase were each produced in E. coli. The α-amylase domain from the α-amylase-pullulanase released maltose, maltotriose and maltotetraose from glycogen, and the pullulanase domain released maltotriose from pullulan, demonstrating that theGardnerellaα-amylase-pullulanase is capable of hydrolyzing α-1,4 and α-1,6 glycosidic bonds. Similarly, the single domain α-amylase protein also produced maltose, maltotriose and maltotetraose from glycogen. Our findings show thatGardnerellaspp. produce extracellular amylase enzymes as 'public goods' that can digest glycogen into maltose, maltotriose and maltotetraose that can be used by the vaginal microbiota.