Streptomycetes, a remarkable genus of filamentous actinobacteria, are well known for their prolific production of bioactive compounds. These microorganisms have long been central to antibiotic discovery, with more than two-thirds of naturally derived antibiotics originating from them. Beyond antimicrobials, Streptomyces species produce a wide array of compounds with antiviral, antifungal, anticancer, antioxidant, and immunomodulatory properties. This chapter explores the diversity and biological potential of Streptomycete-derived metabolites, emphasizing their relevance in pharmaceuticals, agriculture, and environmental sustainability. With the rise of multidrug-resistant pathogens and the urgent need for green alternatives in industry, the untapped biosynthetic potential of Streptomycetes is gaining renewed attention. Advances in genome mining and metabolic engineering are enabling researchers to unlock previously silent gene clusters, leading to the discovery of novel molecules. By highlighting recent findings and applications, this chapter underlines the growing significance of Streptomycetes as a source of innovative solutions across multiple domains of human and environmental health.