Microbial-derived natural compounds represent a vast and largely untapped resource for therapeutic and preventive interventions against a myriad of diseases. This chapter highlights the diverse array of bioactive compounds produced by microbes and their potential applications in healthcare. From antibiotics to immunomodulators, these natural products offer promising avenues for combating microbial infections and bolstering human health. Microbes, including bacteria, fungi, and algae, are prolific producers of bioactive compounds with diverse chemical structures and biological activities. Among these, antibiotics remain the most well-known and widely used microbial-derived therapeutics. Penicillin, discovered from the fungus Penicillium, revolutionized medicine with its ability to combat bacterial infections. However, the emergence of antibiotic resistance underscores the ongoing need for novel antimicrobial agents derived from microbial sources. Beyond antibiotics, microbes produce a wide range of secondary metabolites with potential therapeutic applications. These include antifungal agents, antiviral compounds, immunomodulators, and anticancer drugs, among others. For instance, cyclosporine, also derived from a fungus, has found utility as an immunosuppressive agent in organ transplantation. Similarly, microbial polysaccharides and peptides exhibit immunomodulatory effects that hold promise for the treatment of autoimmune diseases and cancer. Moreover, microbial-derived natural products have shown potential as preventive agents against infectious diseases. Probiotics, live microorganisms that confer health benefits when consumed in adequate amounts, have gained attention for their ability to modulate the gut microbiota and enhance host immune function. Prebiotics, compounds that selectively stimulate the growth of beneficial microbes, offer another avenue for promoting gastrointestinal health and preventing pathogen colonization. In addition to their direct antimicrobial and immunomodulatory effects, microbial-derived natural compounds play a crucial role in shaping host-microbe interactions and maintaining homeostasis within microbial communities. In conclusion, natural compounds derived from microbes offer a rich source of therapeutics and preventive agents for addressing microbial diseases and promoting human health. Continued research into microbial diversity, metabolic pathways, and biotechnological tools will facilitate the discovery and development of novel microbial-derived products with clinical utility.