OSCAR. This dataset of organocatalysts assembled by Gallarati et al. is available online (see Supporting Information) and contains 4,000 catalysts collected either from literature or the Cambridge Structural Database (CSD), along with combinatorially enriched sets for carbene catalysts (over 8,000), and non-covalent dual-hydrogen-bond donor catalysts (ca. 1.5 million). All catalysts have QM-computed stereoelectronic descriptors and DFT-optimized structures available.