Sustainability is considered one of the most important concepts guiding scientific and technological development in the modern era, as it aims to meet present needs while preserving natural resources and ensuring the rights of future generations. With the growing demand for innovative scientific solutions that achieve higher efficiency in resource and energy utilization, nanotechnology has emerged as one of the most promising technologies in supporting sustainability and developing modern environmental and industrial applications. Nanotechnology is based on the design and application of materials at the nanoscale, a extremely small scale that gives materials exceptional properties different from their conventional forms, such as increased surface area, enhanced chemical reactivity, and high adsorption and interaction capacity. These unique properties have made nanomaterials effective tools in many fields related to environmental sustainability. In the field of water treatment, nanomaterials are used in the development of advanced filtration and adsorption systems with high efficiency in removing impurities and pollutants compared to conventional materials. This contributes to improving water quality and reducing resource consumption. Nanomaterials are also used in the fabrication of photocatalysts capable of accelerating the breakdown of harmful compounds using light, thereby enhancing treatment efficiency in a cost-effective and environmentally friendly manner. In the energy sector, nanotechnology has contributed to improving the performance of solar cells, batteries, and energy storage systems by developing materials with higher efficiency in energy absorption, conversion, and storage. It has also helped reduce energy loss and increase the efficiency of devices, supporting the transition toward clean energy and reducing dependence on non-renewable resources. Furthermore, nanotechnology plays an important role in developing sustainable industrial materials characterized by lightweight structure, high durability, and long operational lifespan. This reduces raw material consumption and decreases industrial waste. In addition, nanosensors are widely used in monitoring water and air quality as well as industrial processes with high precision, enabling smart resource management and improving environmental system efficiency. In conclusion, nanotechnology represents a strategic tool for enhancing sustainability across various sectors due to its innovative solutions that improve resource and energy efficiency and enhance the environmental performance of modern technologies. Its role is expected to grow further in the future with continued scientific research and development, making it a key pillar in building a more sustainable and efficient future. Al-Mustaqbal University ranks first among private universities in Iraq.