Electrochemical oxygen reduction reaction (ORR) is a very important reaction for green and sustainable chemistry. Herein, we report the design and synthesis of a semi-crystalline metallopolymer consisting of ferric porphyrin-based building blocks immobilized by organic linkers (viz. various dialdehydes) through rigid imine bonds. All the materials thus obtained showed moderate to high ORR performance in rotating ring-disk electrode voltammetry with oxygen-saturated 0.5 M H2SO4 and 0.1 M KOH.