The Quantum Cluster Database contains 1483 structure types or templates (i.e., relative arrangements of atoms) that were not previously reported in the literature. The 1483 templates were identified from the set of all clusters with calculated energies within 1 meV/atom of the lowest energy cluster with the same element and size. In comparison, there are 684 templates of low-energy templates from the literature (Table1). Before our work, here were 1575 cluster elements and sizes covered by the literature out of 2915, which corresponds to 54%. With the Quantum Cluster Database, the percentage covered increased to 100%.