Philosophy

Famous Philosophical Paradoxes

Name: Famous Philosophical Paradoxes
Creator: Community curated
License: https://creativecommons.org/licenses/by/4.0/

The greatest philosophical paradoxes and thought experiments, from the ancient Greeks to modern philosophy, challenging our understanding of logic, identity, and morality.

Philosophical Paradoxes — 20 entries in the philosophy category, sortable by Paradox, Philosopher, Era. Every row is ranked by community votes, giving you a crowd-sourced perspective you won't find on Wikipedia or IMDb.

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Source:Community curated

Updated:3/7/2026

#paradoxes #philosophy #logic #thought experiments

20/20

Paradox↕	Philosopher↕	Era↕	Field↕	Description↕	Known For↕
Ship of Theseus	Plutarch / Theseus legend	Ancient Greek	Identity / Metaphysics	If every plank of a ship is replaced, is it still the same ship?	The foundational paradox of identity and persistence
Trolley Problem	Philippa Foot	20th century	Ethics	Should you divert a trolley to kill one person instead of five?	The most famous thought experiment in modern ethics
Zeno's Dichotomy	Zeno of Elea	Ancient Greek	Metaphysics	To reach a destination, you must first travel half the distance, then half again, infinitely	Challenging the possibility of motion through infinite division
Liar's Paradox	Epimenides / Eubulides	Ancient Greek	Logic	'This statement is false' — if true, it's false; if false, it's true	The oldest and most fundamental paradox of self-reference
Achilles and the Tortoise	Zeno of Elea	Ancient Greek	Metaphysics	Fast Achilles can never overtake a slow tortoise if the tortoise has a head start	Zeno's most famous paradox about infinite series and motion
Euthyphro Dilemma	Plato	Ancient Greek	Ethics / Theology	Is something good because God commands it, or does God command it because it's good?	Challenging the foundation of divine command morality
Sorites Paradox (Heap)	Eubulides	Ancient Greek	Logic / Language	If you remove one grain from a heap, when does it stop being a heap?	The paradox of vagueness and fuzzy boundaries
Buridan's Ass	Jean Buridan (attributed)	Medieval	Decision Theory	A donkey equidistant between two identical hay bales starves because it cannot choose	Illustrating the problem of rational choice between equal options
Grandfather Paradox	Rene Barjavel	20th century	Metaphysics / Physics	If you travel back in time and prevent your grandfather from meeting your grandmother, you would never be born to travel back	The classic paradox of time travel
Prisoner's Dilemma	Merrill Flood & Melvin Dresher	20th century	Game Theory / Ethics	Two rational individuals might not cooperate even when it's in their mutual best interest	Foundation of game theory and studies of cooperation
Theseus' Paradox of the Heap (Mereological)	Peter van Inwagen	20th century	Metaphysics	Do composite objects really exist, or only fundamental particles arranged object-wise?	Questioning whether tables, chairs, or people truly exist as objects
Brain in a Vat	Hilary Putnam	20th century	Epistemology	How can you prove you're not a brain in a vat being fed simulated experiences?	Modern version of Descartes' evil demon, inspired The Matrix
Omnipotence Paradox	Medieval theologians	Medieval	Theology / Logic	Can God create a stone so heavy that even God cannot lift it?	Challenging the logical coherence of omnipotence
Newcomb's Problem	William Newcomb	20th century	Decision Theory	Should you take one box or two when a perfect predictor has already made a prediction?	Dividing decision theorists between one-boxers and two-boxers
Mary's Room	Frank Jackson	20th century	Philosophy of Mind	A scientist who knows everything about color but has never seen it — does she learn something new when she sees red?	Arguing that subjective experience cannot be reduced to physical facts
Theseus and the Minotaur (identity)	Thomas Hobbes	17th century	Metaphysics	If you reassemble the original planks into a second ship, which is the real Ship of Theseus?	Hobbes' extension adding a second ship from the original parts
Raven Paradox	Carl Hempel	20th century	Logic / Epistemology	Does observing a green apple confirm the hypothesis that all ravens are black?	Challenging inductive reasoning and confirmation theory
Unexpected Hanging	Unknown origin	20th century	Logic / Epistemology	A judge says the hanging will be a surprise, but the prisoner reasons it can't happen on any day	Self-defeating predictions and the nature of surprise
Experience Machine	Robert Nozick	20th century	Ethics	Would you plug into a machine that gives you any experience you desire? Most say no.	Arguing against hedonism — we value reality, not just pleasure
Chinese Room	John Searle	20th century	Philosophy of Mind / AI	A person following rules to respond in Chinese doesn't understand Chinese — can a computer truly understand?	The strongest argument against strong artificial intelligence

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This dataset contains 20 entries, each with multiple sortable, filterable columns. The full table is visible on this page and can be downloaded as a CSV, JSON, or Excel file.

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Famous Philosophical Paradoxes

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