The purpose of this thesis is to provide an in-depth examination of the syntactic rules and pragmatic structures that govern the construction of Thai nominal phrases. There is a current debate among linguistic researchers of the Thai language (and others within the Tai-Kadai family) contemplating whether the inherent syntactic structure of nominal phrases projects a Determiner Phrase [DP] or a Noun Phrase [NP] (Birmingham, 2020; Jenks, 2011; Piriyawiboon, 2010; and Singhapreecha, 2001). An examination of the grammatical and pragmatic features that dictate the formation of Thai nominals, as well as an investigation of the prevailing linguistic theories focused on nominal phrase construction supporting each structure, has been conducted and is presented within this thesis. This extensive research, performed to address the dilemma “Does the Thai language project a DP or an NP?”, has resulted in the conclusion that the Thai language, with its free word-order and its fascinating pragmatic structures, projects an underlying NP phrase structure that allows for an optional determiner, used to indicate specificity.