The aim of this thesis is to define, develop, and defend an interpretation and application of the mystical ontology of Meister Eckhart. Briefly, mystical ontology should be understood as a distinctive theology insofar as it presents God's being, the being of the world, and the individual's being as an essentially unified whole. My research focus for this thesis will then be to situate Eckhart's theology within current debates on mysticism and amidst the post-Kantian philosophical turn toward ontology. The cumulative effort of this thesis will reach its height when I apply my conclusions on the mystical nature of being that can be found in Eckhart's medieval writings and transcriptions in order to address the modern, theological problem of secularity. This effort will be implemented with the objective of creating a space for dialogue between Christian theology and the generally secularized culture that, in part, defines the present age. In so doing, this thesis will demonstrate the philosophical and cultural relevance of this particular understanding of the nature of being when treating modern problems in theology. The guiding question for this thesis will be the following: what insights can Meister Eckhart's thought offer to theologians today in addressing the problem of secularity? My overall thesis will then be: the mystical ontology of Meister Eckhart can be interpreted and applied in a manner that successfully opens a space for constructive dialogue between secular culture and the presence of God in the world. Overall, this thesis should be read as a scholarly project on Eckhartian theology and its applicability toward productively treating the problem of secularity. All of my conclusions will be derived as a result of having been situated and argued for amidst current debates on relevant topics, as well as in relation to other major works that are indispensable for such a project. To be clear, my aim will not be to appropriate Eckhart's work and to assimilate it to a post-Kantian perspective. Rather, I will look to Eckhart for his clear and definitive theological statements. I will then interpret those statements and apply them in a manner that efficaciously engages specific principles of secularity in demarcating a common ground for dialogue.