The persistent accumulation of recalcitrant pollutants in the environment presents serious ecological and public health concerns due to their long-term stability, toxicity, and bioaccumulation potential. Among the various remediation strategies, microbial bioremediation stands out as a sustainable and eco-friendly approach that utilizes the enzymatic capabilities of microorganisms to convert toxic compounds into less harmful or inert byproducts. This chapter provides a comprehensive overview of key aspects related to microbial bioremediation. First, it discusses the major classes of persistent environmental contaminants, including heavy metals, pesticides, hydrocarbons, and synthetic dyes. Next, it explores the underlying biodegradation mechanisms employed by bacteria, fungi, and algae, with schematic illustrations to elucidate their metabolic pathways. A comparative analysis of degradation efficiencies across different microbial species is presented in tabular format, offering insights into their effectiveness under varied environmental conditions. Additionally, special emphasis is placed on emerging microbial strains with enhanced degradation potential, such as genetically engineered bacteria and extremophiles, which show promise in tackling complex and resistant pollutants. These novel strains contribute to the development of efficient bioremediation strategies tailored for diverse ecosystems. The chapter concludes by emphasizing the need for continued research and technological integration to optimize microbial bioremediation approaches. Overall, the insights presented aim to support the advancement of practical and scalable bioremediation technologies, contributing to global efforts toward environmental sustainability and pollution mitigation.