In this study, we have applied the same DFT/TDDFT computational approach to understanding the electronic absorption spectroscopy of meso-tetrakis(4hydroxyphenyl)porphyrin (H2[THPP]), which is of significant theoretical interest as well as important for a variety of applications. Thus, Milgrom and coworkers have extensively studied sterically hindered analogues of H2[THPP] with t-butyl groups flanking the hydroxy groups at the ortho positions. In these cases, the phenols oxidize in air to form stable phenoxy radicals, resulting in hyperporphyrin spectra. Further oxidation of H2[THPP] derivatives leads to oxoporphyrinogens, which are of interest as catalysts and sensors. Like H2[TAPP], H2[THPP] also undergoes oxidative polymerization. A composite of H2[THPP] and cubic Cu2O has also been found to exhibit efficient photocatalytic hydrogen evolution. In many of these applications, the broad visible absorption of the compounds plays a significant role. A DFT/TDDFT study of the electronic absorption spectra of H2[THPP] under different conditions using current computational models thus appears to be an eminently worthwhile goal.