The thesis aims to explore the Stoic influences on Plutarch’s cosmology and theology. The work is structured in three parts. The first part is devoted to outlining the background of Plutarch’s Platonism: the first chapter reconstructs some central tenets of Stoic physics (principles, elements, cosmogony, providence), while the second chapter provides a reconstruction of Platonic strains before Plutarch. The second part explores the way Plutarch appropriates the demiurgic model and his debts to Stoicism, with a specific focus on the De E and the De animae procreatione. The third part is devoted to assessing Plutarch’s doctrines of matter and the cosmic soul and analysing the role played by the Stoics in this story. The overall claim of the thesis is that Plutarch’s notion of cause is developed by appropriating the Stoic notion of cause and framing it in a Platonic ontology.