This chapter surveys research on light induced reactions of organic molecules investigated in cryogenic matrices that has been reported during 2021 and 2022. It highlights studies dealing with conformational changes, tautomerizations and other structural isomerizations induced either by ultraviolet/visible or infrared light, as well as photofragmentation reactions. Emphasis is given to reactive intermediates, including nitrenes, carbenes and radicals. The studies featured in the present review are examples of recent applications of the matrix isolation method, coupled with spectroscopic probing, to these areas of investigation.