ABSTRACT In this chapter, we describe additive manufacturing (AM) processes for polymers and for composites where polymers are used. These include cases where polymers are the only material used, where they are added as binders in the case of ceramics, and in polymer composites where they are used either as a thermoplastic resin or as a thermoset resin with ber reinforcement. Examples of AM processes for both chopped ber and continuous ber-reinforced composites are described. Some special cases such as nanocomposites and their applications are described. The chapter concludes with current challenges and future trends in the AM eld with emphasis on polymers and composites.