This chapter explores the innovative 4D printing of polysaccharides, emphasizing its transformational capability for producing dynamic and stimuli-responsive materials. By integrating time as the fourth dimension, 4D printing enhances the functionalities of traditional 3D printing to create structures that can adapt, transform, or modify their properties in response to environmental stimuli such as temperature, pH, moisture, or light. Due to their natural abundance, biocompatibility, and simplicity of chemical modification, polysaccharides are exemplary prospects for designing 4D-printed materials. The chapter examines several polysaccharide additive manufacturing processes, including advanced printing technologies and post-printing functionalization approaches. It offers a comprehensive analysis of the stimuli-responsive behaviours shown by polysaccharide-based materials and their mechanism of action. Moreover, it highlights the diverse applications of 4D-printed polysaccharides in domains like drug delivery, tissue engineering, soft robotics, and environmental remediation. Challenges such the precise control over material or shape transformations, scalability, and material stability are also addressed. The chapter anticipates future developments in polysaccharide-based 4D printing, enabling the creation of more innovative, sustainable, and versatile materials for advanced applications.