Abstract: Herein, a polymer supported Fe-Phthalocyanine entangled with carboxyl functionalized benzimidazolium moiety (PSFePcCFBM) explored as heterogenous photocatalyst, for regioselective synthesis of 1H-tetrazoles from sodium azide and other affordable substrates. The PSFePcCFBM displayed good to excellent yield of the product (79–91%) under visible light (5 W) irradiations using home-made photoreactor. The NaN3 acts as a nitrogen donor of tetrazoles ring as well as it convert aldehyde into isocyanide as one of the nitrogen sources. The catalyst could be recycled up to 5th run successfully without altering its catalytic activity. The small amount of the catalyst loading, extensive substrate range, ease of separation of the catalyst by simple filtration, less reaction time, simple workup procedure, and excellent product yield are the salient features of the investigated protocol. Graphic Abstract: [Figure not available: see fulltext.] © 2020, Springer Science+Business Media, LLC, part of Springer Nature.