High pressure study to investigate the polymorphism of para-aminobenzoic acid. Investigation discovered previously unreported polymorph of para-aminobenzoic acid designated the delta-polymorph. Data contained herein for characterization of the new delta polymorph including spectroscopy and single-crystal structure resolution. All data files converted to readily accessible format (.txt and .csv) with the exception of single crystal diffraction images that remain in their native format (.sfrm, Bruker format) - important header information required for image processing part of each image file. Neutron diffraction data files in readily accessible .DAT format that can be viewed using a text editor application.