Hybrid nanomaterials have become a revolutionary group of designed systems that combine the complementary physicochemical characteristics of various constituents on the nanoscale, presenting novel prospects in developing technologies that are sustainability-oriented. These materials incorporate organic, inorganic, and bio-inspired constituents into a single architecture, which makes the materials allow synergistic capabilities that cannot be achieved by single-component systems. Their use has grown substantially in the last few years in catalysis, environmental remediation, and advanced energy systems due to the pressing necessity to solve global problems of resource depletion, pollution and climate change. Hybrid nanomaterials in catalytic processes exhibit superior activity, selectivity and stability as a result of optimized surface interfaces and adjustable electronic structures that enable effective generation of pollutants and renewable feedstocks. Simultaneously, their use in environmental science has become mainstream due to their application in water purification, air filtration, and sensing platforms, where the high surface area and versatile use allow quick and selective removal of contaminants. These materials are also used in energy-related fields, such as supercapacitors, batteries and photocatalytic devices, where they advance the high-performance of storage and conversion systems by enhancing the charge transport, energy density and cycling stability. Even with these developments, scalability and long-term stability issues, as well as environmental impact, are a key obstacle to large-scale adoption. This review shows that in recent times, there has been an advancement in the rational design, synthesis and functional optimization of hybrid nanomaterials, with a focus on structure-property interactions and their potential application in sustainability. Moreover, it discusses new directions and the future visions targeted at closing the gap between laboratory development and industrial adoption.