<p>Water oxidation is a key half-reaction in artificial photosynthesis, and metalloporphyrin complexes have emerged as promising molecular catalysts owing to their well-defined coordination geometry and redox-active nature. Metalloporphyrin systems based on main-group metal ions such as Al³⁺, Si⁴⁺, Ge⁴⁺, and Sn⁴⁺ have been extensively studied for the direct two-electron oxidation of water initiated by one-electron oxidation; however, indium-based porphyrins remain largely unexplored. Herein, we report the synthesis and characterization of two indium (III) porphyrins—5,10,15,20-tetrakis(4-pyridyl)porphyrinate indium (III) (InTPyP) and its <i>N</i>-methylated derivative, 5,10,15,20-tetrakis(<i>N</i>-methyl-4′-pyridiniumyl)porphyrinate indium (III) (InTMPyP). These compounds were designed as analogs to previously reported aluminum porphyrins. A comparative investigation of their electronic, photophysical, and photocatalytic properties was conducted, highlighting the potential of indium-based systems for photo-driven catalytic reactions.</p>