Lignin is an amorphous biopolymer consisting of hydroxyphenyl propane units, which are interlinked with ether and biphenyl linkages. The widespread abundance and variation in the substitution of phenolic units in the nature of plant species present them as a viable source for phenolic raw materials. This chapter aims to list the major phenolic components available from lignin and its utility as a synthon for benzoxazine monomer synthesis. The presence of additional functionalities in the monomer dictates the polymer properties and its utility in various applications. © 2017 Elsevier Inc. All rights reserved.