Background: A mangrove is a small tree or shrub that typically thrives in salty coastal waters. It refers to the unique vegetation found in tropical coastal regions, comprising specific species. Mangroves are prevalent across the globe, primarily in tropical and subtropical regions, typically within latitudes 25° N and 25° S. The global mangrove forest area covers 137,800 square kilometers, spread across 118 countries and territories. This research sought to assess the antibacterial properties of nanoparticles created from Rizophora extract. Materials and Methods: The research was carried out at the Green lab of Saveetha Dental College, following approval from the Institutional Review Board of the university. Leaves and barks of Rhizophora were gathered from the Gulf of Mannar Biosphere Reserve in Tamil Nadu. The gathered samples were first washed thoroughly with tap water and then air-dried in the shade on table tissue paper for a duration of four weeks. Afterwards, both the leaves and bark underwent a secondary wash under running tap water and were then dried in an incubator set at 40°C. Using an electric blender, the dried leaves and bark were finely crushed into uniform powders. These powders were subsequently soaked in three distinct solvents (95% ethanol, methanol, and chloroform) at room temperature in the absence of light for three days. Following this, each sample was filtered through Whatman® No. 1 filter paper (Whatman International, England), and the resulting filtered solutions were evaporated to dryness utilizing a water evaporator set at 40°C. The resultant plant extracts were dissolved in dimethyl sulfoxide (DMSO). Results: The antibacterial efficacy of the Rhizophora extract was assessed through two distinct assays: the disc diffusion method and the Minimum Inhibitory Concentration (MIC) assay. In the disc diffusion test, various concentrations of the chosen clinical isolates (Klebsiella, Streptococcus, and Vibrio) were employed. Results indicated that S. aureus displayed the widest zone of inhibition, followed by Klebsiella and S. mutans. Conclusion: This research investigated the Streptomyces species associated with the study and found that it demonstrated potent antibacterial properties. Consequently, it can be inferred that it possesses effective antibacterial activity against the targeted microorganisms (Klebsiella, Streptococcus, and Vibrio). This suggests potential for further exploration in future studies.