Large collections of infrared spectra are owned by private organizations across a variety of domains, and no unified "machine learning ready" dataset is available. As such, it was necessary to obtain, clean, and process a library of IR spectra from several different domains. IR spectra were obtained from three online sources: the National Institute of Advanced Industrial Science and Technology (AIST), the National Institute of Standards and Technology (NIST), and the Coblentz Society. Complete data access statements can be found in the supplementary information. In total, these datasets contain a mixture of gas-phase and condensed-phase IR spectra. The condensed phase spectra included spectra obtained in media including pressed KBr pellets, nujol mull (suspension in mineral oil), carbon tetrachloride (CCl4) solution, and pure liquid film. A complete breakdown of the composition of these spectra can be found in Figure .