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In this study, we biosynthesized the stable silver nanoparticles (AgNPs) from <i>Momordica cymbalaria</i> leaves to evaluate their antioxidant, antibacterial, cytotoxic, and photocatalytic properties. Initially, we screened the bioactive compounds from <i>M. cymbalaria</i> extract using GC-MS. The biosynthesis of <i>Mc</i>-AgNPs was confirmed using instruments, such as UV-visible spectroscopy FT-IR, XRD, SEM with EDX, and HR-TEM analyses. The UV-visible spectrum indicated absorbance at 425 nm. The crystallite size of the <i>M. cymbalaria</i>-stabilized nanoparticles was determined to be 20.14 nm. The morphology and size of the synthesized <i>Mc</i>-AgNPs were confirmed via SEM-EDX and HR-TEM analyses, with a size range from 16 to 22 nm. The synthesized <i>Mc</i>-AgNPs exhibited a photocatalytic yield of 60%. The biosynthesized <i>Mc</i>-AgNPs demonstrated strong antioxidant properties and prominent antibacterial activity against human pathogenic bacteria. The cytotoxicity study revealed that <i>Mc</i>-AgNPs were effective against MCF-7 cells in a dose-dependent manner. The recognized bioactivities confirm that the synthesized <i>Mc</i>-AgNPs act as effective catalysts in oxidation and serve as potent antioxidant, anticancer, and antibacterial agents.