Nanomaterials made of cellulose and lignocellulose have special qualities such a huge surface area, great mechanical strength, and biodegradability. They may find applications in various industries, including environmental remediation, composites, biomedical materials, and packaging. Using the processes developed for other nanomaterials as platforms to create new wood-based materials and applications will require new methods to liberate these components, such as nanodimensional cellulose fibrils, macromolecules, and nanomaterials. These materials can be made multifunctional and self-assembled into distinct architectures. Numerous facets of papermaking have shown encouraging outcomes from the application of nanotechnology; studies have demonstrated that incorporating cellulose nanofibers can enhance the mechanical properties of paper by up to 50%. Cellulose nanofibers have been prepared by several research groups using techniques such as electrospinning, chemical treatment followed by mechanical procedures, or mechanical separation methods. In specific processes, yields of cellulose nanofibers have reached as high as 90%. These developments demonstrate the great potential of cellulose and lignocellulose as environmentally friendly nanomaterials for a range of industrial uses. This chapter explores the use of nanotechnology in the pulp and paper industry, highlighting its potential to improve paper properties like strength, printability, glossiness, and gas barrier capabilities. It emphasizes how nanotechnology can promote sustainability and efficiency by optimizing resource utilization and minimizing environmental impact.