Polysaccharide-based 3D hydrogels have emerged as innovative materials in advanced food applications due to their biocompatibility, biodegradability, and unique physicochemical properties. These hydrogels can retain significant amounts of water while maintaining structural integrity, making them suitable for applications such as food packaging, nutrient delivery, and texture modification. This chapter examines the synthesis, characterization, and application of polysaccharide-based 3D hydrogels, highlighting their role in improving food quality, shelf life, and safety. Additionally, the chapter discusses recent advancements in hydrogel engineering, including the integration of bioactive compounds, stimuli-responsive behavior, and smart packaging systems. Future perspectives on scaling up production, regulatory challenges, and commercialization opportunities are also addressed.