The evolving demands of consumers have transformed textiles from conventional clothing materials into multifunctional systems. Surface functionalization plays a central role in enabling these tailored properties, and the emergence of two-dimensional (2D) printing and three-dimensional (3D) printing has greatly expanded the design space for such modifications. This chapter examines how contemporary 2D and 3D printing techniques are reshaping textile surface functionalization, reviewing major 2D methods such as screen, gravure, inkjet, and flexographic printing, as well as key 3D processes including vat photopolymerization, material jetting, binder jetting, and material extrusion. It discusses critical factors such as ink formulation, adhesion, material selection, and process optimization. The chapter illustrates how 2D printing can impart conductivity, protection, sensing capabilities, and integrated electronic features while preserving fabric flexibility, whereas 3D printing enables fully or partially printed textile structures and direct polymer deposition for applications in healthcare, sportswear, defense, automotive components, and filtration media. In addition, it addresses sustainability aspects, including the use of biopolymers, waste-reduction strategies, and circular design concepts, and outlines current challenges and future research opportunities for advancing the functionalization of printed textiles.