Monism

===Modern===
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* [[Alexander Bogdanov]]
* [[F. H. Bradley]]
* [[Giordano Bruno]]<ref>''De la causa, principio e Uno, London, 1584''</ref><ref>''De monade (De monade, numero et figura liber consequens quinque de minimo magno et mensura), Frankfurt, 1591''</ref>
* [[Gilles Deleuze]]
* [[Friedrich Engels]]
* [[Johann Gottlieb Fichte]]
* [[Ernst Haeckel]]<ref>[https://archive.org/details/wonderslifeapop01haecgoog ''Wonders of Life''] by Ernst Haeckel.</ref><ref>[https://books.google.com/books?id=RdsdAAAAMAAJ The Evolution of Man: A Popular Scientific Study, Volume 2] by Ernst Heinrich Philipp August Haeckel.</ref>
* [[David Bentley Hart]]
* [[Georg Wilhelm Friedrich Hegel]]
* [[Christopher Langan]]
* [[Giacomo Leopardi]]<ref>{{Cite web|url=https://www.ft.com/content/ae962862-03fc-11e3-8aab-00144feab7de |archive-url=https://ghostarchive.org/archive/20221210/https://www.ft.com/content/ae962862-03fc-11e3-8aab-00144feab7de |archive-date=2022-12-10 |url-access=subscription |url-status=live|title=Review: Giacomo Leopardi's 'Zibaldone'|date=2013-08-16|website=Financial Times|language=en-GB|access-date=2018-05-05}}</ref>
* [[Ernst Mach]]
* [[Karl Marx]]
* [[Wilhelm Ostwald]]
* [[Charles Sanders Peirce]]
* [[Georgi Plekhanov]]
* [[Gilbert Ryle]]
* [[Jonathan Schaffer]]
* [[Friedrich Wilhelm Joseph Schelling]]
* [[Hans Jonas]]<ref name="S">Sariel, Aviram. "Jonasian Gnosticism." Harvard Theological Review 116.1 (2023): 91-122, here 99.</ref>
* [[Arthur Schopenhauer]]
* [[Rupert Sheldrake]]
* [[B.F. Skinner]]
* [[Herbert Spencer]]
* [[Baruch Spinoza]]
* [[Rudolf Steiner]]
* [[Alan Watts]]
* [[Alfred North Whitehead]]
}}