I plan to pursue a part of a large, long-term research project, groundbreaking and more and more needed, which will fill a wide and long-standing gap in ancient and patristic philosophy. It will also bridge the disciplinary divide between philosophy and theology. The whole research consists in a thorough, systematic assessment of the points of convergence and divergence between Origen as a philosopher and Plotinus. This has been for a long time a substantial desideratum. I shall approach Origen’s and Plotinus’s philosophical systems in light of (1) much new research into Origen’s authentic ideas, his possible identity with the homonymous Neoplatonist, and the school of Ammonius Saccas, most probably Origen’s and Plotinus’s common teacher; (2) ongoing investigation into Plotinus; and (3) recent scholarship on Porphyry, informed by new perspectives (e.g. by Johnson, partially Digeser, Simmons, and new research projects on Porphyry).