Industrial effluents are a major source of water pollution, necessitating effective wastewater treatment methods. Clay minerals and polymers, while individually limited, synergistically enhance water treatment as clay-polymer nanocomposites (CPNs). This paper highlights diverse CPN types, their synthesis, and factors influencing their efficiency, including pH, temperature, contact time, pollutant concentration, and adsorbent dose. Emphasizing maximum adsorption capacity, adsorption mechanisms, and kinetics, the study underscores CPNs’ potential as a top-tier long-term solution for wastewater treatment. Wastewater sludge management constitutes a critical facet of wastewater treatment processes, with the potential for innovative solutions through the utilization of clay-polymer nanocomposites. These materials, which amalgamate the advantageous properties of polymers and nanoscale clays, hold promise for enhancing the treatment and disposal of wastewater sludge. This chapter offers a comprehensive overview of the multifaceted application of polymer nanocomposite clays in managing wastewater sludge, addressing various challenges through a systematic approach.