Branislav "Brana" Petronijević (sometimes styled as Petronievics) (Serbian Cyrillic: Бранислав "Брана" Петронијевић; 6 April 1875 – 4 March 1954) was a Serbian philosopher and paleontologist. His major work is the two-volume Prinzipien der Metaphysik (Principles of Metaphysics, Heidelberg, 1904–1911), in which he outlines his original metaphysical system – a synthesis of Baruch Spinoza's monism and Gottfried Leibniz's monadological pluralism into what he called "monopluralism". Influenced by George Berkeley and G.W.F. Hegel, Petronijević held that our immediate experience is the source of basic logical and metaphysical axioms – what he called "empirio-rationalist" epistemology.