Since the first report of an isoporphyrin by Dolphin over 50 years ago, isoporphyrinoids have grown into a major class of compounds within the vast field of porphyrin analogues (the subject of a special issue of Chemical Reviews 2 ). They are characterized by one ore more saturated meso carbons, which interrupt or greatly diminish the global aromaticity of the macrocycle. Today, the isoporphyrinoids also include (in addition to isoporphyrins ) phlorins, porphyrinogens, 9,10 calixpyrroles, calixphyrins, and isocorroles as well as their expanded and N-confused derivatives. The macrocycles are of interest for a variety of reasons, obviously as novel transition metal ligands, but also as platforms for NIR dyes, molecular recognition (especially anion sensing ), and drug delivery. Herein, we wish to disclose the serendipitous discovery of new isoporphyrinoid -calixcorrole -the corrole analogue of calixphyrin.