| Name | Life | School | Notes | 
|---|
| Acrion | 5th/4th century BC | Pythagorean | visited by Plato | 
| Adrastus of Aphrodisias | 2nd century AD | Peripatetic | wrote commentaries on Aristotle's works and a commentary on Plato's Timaeus | 
| Aedesia | 5th century | Neoplatonic | wife of Hermias, and mother of Ammonius and Heliodorus | 
|
| Aedesius | 3rd/4th century | Neoplatonic | studied under Iamblichus before founding his own school in Pergamum | 
| Aeneas of Gaza | 5th/6th century | Neoplatonic | Christian convert who studied under Hierocles | 
| Aenesidemus | 1st century BC? | Pyrrhonist | wrote a book called Pyrrhonist Discourses which became a central text for the Pyrrhonists | 
| Aesara | 5th/4th century BC | Pythagorean | wrote On Human Nature, of which a fragment is preserved by Stobaeus | 
| Aeschines of Neapolis | 2nd/1st century BC | Academic skeptic | shared the leadership of the Academy at Athens together with Charmadas and Clitomachus about 110 BC | 
| Aeschines of Sphettus | 5th/4th century BC | Socratic | part of Socrates' circle and likely present at his death | 
| Aetius | 4th century AD | Peripatetic | Antiochean convert to Christianity who studied in Alexandria | 
| Agapius | 5th/6th century AD | Neoplatonic | studied under Marinus of Neapolis. known for his learning | 
| Agathobulus | 1st/2nd century AD | Cynic | known for his severe asceticism and teacher of Demonax | 
| Agathosthenes | uncertain date | geographer, historian or philosopher | referred to by Tzetzes as his authority in matters connected with geography. | 
| Agrippa the Skeptic | 1st/2nd century AD | Pyrrhonist | thought to be the creator of the "five grounds of doubt" | 
| Albinus | 2nd century AD | Middle Platonist | 
| Alcibiades | 450-404 BC | Socratic | Athenian General and Politician | 
| Alcinous | 2nd century AD? | Middle Platonist | 
| Alcmaeon of Croton | 5th century BC | Pythagorean | interested in medicine | 
| Alexamenus of Teos | 5th century BC? | Socratic | may have been the first to write philosophical dialogues | 
| Alexander of Aegae | 1st century AD | Peripatetic | tutored the emperor Nero | 
| Alexander of Aphrodisias | 2nd/3rd century AD | Peripatetic | influential commentator on the Corpus Aristotelicum | 
| Alexicrates | 1st/2nd century AD | Pythagorean | 
| Alexinus | 4th/3rd century BC | Megarian | founded his own school which did not fare well | 
| Amelius | 3rd century AD | Neoplatonic | student of Plotinus who wrote voluminously | 
| Ammonius Hermiae | 5th/6th century AD | Neoplatonic | 
| Ammonius of Athens | 1st century AD | Middle Platonist | teacher of Plutarch | 
| Ammonius Saccas | 2nd/3rd century AD | Neoplatonic | Plotinus' teacher | 
| Anaxagoras | 5th century BC | Pluralist |  | 
| Anaxarchus | 4th century BC | Atomist | first Greek to attempt the problem of squaring the circle | 
| Anaxilaus | 1st century BC / 1st century AD | Pythagorean | Banished from Rome for practising magic | 
| Anaximander | 7th/6th century BC | Milesian | First to conceive a mechanical model of the world | 
| Anaximenes of Miletus | 6th century BC | Milesian |  | 
| Androcydes | 2nd century BC? | Pythagorean |  | 
| Andronicus of Rhodes | 1st century BC | Peripatetic |  | 
| Anniceris | 4th/3rd century BC | Cyrenaic |  | 
| Antiochus of Ascalon | 2nd/1st century BC | Middle Platonist |  | 
| Antipater of Cyrene | 4th century BC | Cyrenaic |  | 
| Antipater of Tarsus | 2nd century BC | Stoic |  | 
| Antipater of Tyre | 1st century BC | Stoic |  | 
| Antisthenes | 5th/4th century BC | Cynic |  | 
| Antoninus | 4th century AD | Neoplatonic |  | 
| Apollodorus of Athens | 2nd century BC | Stoic |  | 
| Apollodorus of Seleucia | 2nd century BC | Stoic |  | 
| Apollodorus the Epicurean | 2nd century BC | Epicurean |  | 
| Apollonius Cronus | 4th century BC | Megarian |  | 
| Apollonius of Tyana | 1st century AD | Neopythagorean |  | 
| Apollonius of Tyre | 1st century BC | Stoic |  | 
| Arcesilaus | 4th/3rd century BC | Academic skeptic |  | 
| Archedemus of Tarsus | 2nd century BC | Stoic |  | 
| Archelaus | 5th century BC | Pluralist |  | 
| Archytas | 5th/4th century BC | Pythagorean | 
| Arete of Cyrene | 4th century BC | Cyrenaic |  | 
| Arignote | 6th/5th century BC | Pythagorean |  | 
| Aristarchus of Samos | 4th/3rd century BC | Academic skeptic | presented the first known model that placed the Sun at the center of the known universe with the Earth revolving around it. | 
| Aristippus | 5th/4th century BC | Cyrenaic |  | 
| Aristippus the Younger | 4th century BC | Cyrenaic |  | 
| Aristoclea | fl. 6th century BC |  | 
| Aristocles of Messene | 1st century AD? | Peripatetic |  | 
| Aristocreon | 3rd/2nd century BC | Stoic |  | 
| Aristo of Alexandria | 2nd /1st century BC | Peripatetic |  | 
| Aristo of Ceos | 3rd/2nd century BC | Peripatetic |  | 
| Aristo of Chios | 4th/3rd century BC | Stoic |  | 
| Aristotle | 4th century BC | Peripatetic | founder of Peripatetic school; student of Plato | 
| Aristotle of Cyrene | 4th/3rd century BC | Cyrenaic |  | 
| Aristotle of Mytilene | 2nd century AD | Peripatetic |  | 
| Aristoxenus | 4th century BC | Peripatetic |  | 
| Arius Didymus | 1st century BC | Stoic |  | 
| Asclepiades of Phlius | 4th/3rd century BC | Eretrian |  | 
| Asclepiades the Cynic | 4th century AD | Cynic |  | 
| Asclepigenia | 5th/6th century AD | Neoplatonic |  | 
| Asclepiodotus | 1st century BC |  |  | 
| Asclepiodotus of Alexandria | 5th century AD | Neoplatonic |  | 
| Aspasius | 2nd century AD | Peripatetic |  | 
| Athenaeus of Seleucia | 1st century BC | Peripatetic |  | 
| Athenodoros Cananites | 1st century BC | Stoic |  | 
| Athenodoros Cordylion | 2nd /1st century BC | Stoic |  | 
| Athenodorus of Soli | 3rd century BC | Stoic |  | 
| Attalus | 1st century BC - 1st century AD | Stoic |  | 
| Atticus | 2nd century AD | Middle Platonist |  | 
| Basilides (Stoic) | 2nd century BC | Stoic | Denied the existence of incorporeal entities | 
| Basilides the Epicurean | 3rd/2nd century BC | Epicurean | Succeeded Dionysius of Lamptrai as the head of the Epicurean school at Athens | 
| Batis of Lampsacus | 3rd century BC | Epicurean |  | 
| Bion of Borysthenes | 4th/3rd century BC | Cynic | Once was a slave, later to be released | 
| Boethus | 4th century BC | Platonist |  | 
| Boethus the Epicurean | 1st century AD | Epicurean |  | 
| Boethus of Sidon | 1st century BC | Peripatetic |  | 
| Boethus of Sidon | 2nd century BC | Stoic |  | 
| Bolus of Mendes | fl. 3rd century BC | Pythagorean |  | 
| Brontinus | fl. 6th century BC | Pythagorean |  | 
| Bryson of Achaea | fl. 330 BC | Megarian |  | 
| Callicles | 5th century BCE | Sophist? |  | 
| Calliphon | 2nd century BC | Peripatetic |  | 
| Calliphon of Croton | 6th century BC | Pythagorean |  | 
| Callistratus | fl. 3rd century AD | Sophist |  | 
| Carneades | c. 214 – 129/8 BC | Academic skeptic |  | 
| Carneiscus | c. 300 BC | Epicurean |  | 
| Cassius Longinus | c. 213–273 | Middle Platonist |  | 
| Cebes | c. 430–350 BC | Pythagorean |  | 
| Celsus | 2nd century |  |  | 
| Cercidas | 3rd century BC | Cynic |  | 
| Cercops |  | Pythagorean |  | 
| Chaerephon | c. 470/460 – 403/399 BCE | Socratic |  | 
| Chamaeleon | 350-275 BC | Peripatetic |  | 
| Charmadas | 164 - c. 95 BC | Academic skeptic |  | 
| Chrysanthius | fl. 4th century | Neoplatonic |  | 
| Chrysippus | 279-206 BC | Stoic |  | 
| Cleanthes | 330-230 BC | Stoic |  | 
| Clearchus of Soli | 4th/3rd century BC (fl. 320 BC) | Peripatetic |  | 
| Cleinias of Tarentum | 4th century BC | Pythagorean |  | 
| Cleomedes |  | Stoic |  | 
| Cleomenes | fl. c. 300 BC | Cynic |  | 
| Clinomachus | 4th century BC | Megarian |  | 
| Clitomachus | 187 - 109 BC | Academic skeptic |  | 
| Colotes | 320-268 BC | Epicurean |  | 
| Crantor | born c. 350 BC | Academic Platonist |  | 
| Crates of Athens | died 268-265 BC | Academic Platonist |  | 
| Crates of Mallus | fl. 2nd century BC | Stoic |  | 
| Crates of Thebes | c. 365 – c. 285 BC | Cynic | husband of Hipparchia of Maroneia | 
| Cratippus of Pergamon | 1st century BC | Peripatetic | friend of Cicero | 
| Cratylus | 5th century BC | Ephesian |  | 
| Crescens the Cynic | 2nd century | Cynic |  | 
| Crinis | 1st/2nd century BC | Stoic |  | 
| Critolaus | c. 200 – c. 118 BC | Peripatetic |  | 
| Cronius | fl. 2nd century A.D. | Neopythagorean |  | 
| Damascius | born c. 458, died after 538 | Neoplatonic |  | 
| Damis | 1st/2nd century A.D. | Neopythagorean |  | 
| Damo | 5th century BC | Pythagorean | reportedly the daughter of Pythagoras and Theano | 
| Dardanus of Athens | 160-85 BC | Stoic | one of the several leaders of Stoa after the death of Panaetius | 
| Demetrius Lacon | fl. late 2nd century BC | Epicurean | 
| Demetrius of Amphipolis | fl. 4th century BC | Academic Platonist |  | 
| Demetrius Phalereus | c. 350 – c. 280 BC | Peripatetic | Governed Athens | 
| Demetrius the Cynic | fl. 1st century | Cynic |  | 
| Democrates | unknown | Pythagorean? |  | 
| Democritus | c. 460 – c. 370 BC | Presocratic, Atomist |  | 
| Demonax |  | Cynic |  | 
| Dexippus | fl. 350 | Neoplatonic |  | 
| Diagoras of Melos |  | Sophist |  | 
| Dicaearchus |  | Peripatetic |  | 
| Dio of Alexandria | fl. 1st century BC | Academic skeptic |  | 
| Dio Chrysostom |  | Sophist |  | 
| Diocles of Cnidus | fl. 3rd or 2nd century BC? | Academic Platonist |  | 
| Diodorus Cronus |  | Megarian |  | 
| Diodorus of Adramyttium | fl. 1st century BC | Academic skeptic |  | 
| Diodorus of Aspendus |  | Pythagorean |  | 
| Diodorus of Tyre |  | Peripatetic |  | 
| Diodotus |  | Stoic |  | 
| Diogenes of Apollonia |  | Presocratic |  | 
| Diogenes of Babylon |  | Stoic |  | 
| Diogenes of Oenoanda |  | Epicurean |  | 
| Diogenes of Seleucia |  | Epicurean |  | 
| Diogenes of Sinope | 412/404 - 323 BC | Cynic | Lived in a clay wine jar | 
| Diogenes of Tarsus |  | Epicurean |  | 
| Dionysius of Chalcedon |  | Megarian |  | 
| Dionysius of Cyrene |  | Stoic |  | 
| Dionysius of Lamptrai |  | Epicurean |  | 
| Dionysius the Renegade |  | Stoic | abandoned Stoicism for Cyrenaicism | 
| Dios | fl. 7th century BC ? | Pythagorean |  | 
| Diotima of Mantinea |  | 
| Diotimus |  | Stoic |  | 
| Domninus of Larissa | c. 420 - c. 480 | Neoplatonic |  | 
| Echecrates |  | Pythagorean |  | 
| Ecphantus |  | Pythagorean |  | 
| Empedocles |  | Presocratic, Pluralist |  | 
| Epicharmus of Kos |  | Pythagorean |  | 
| Epictetus |  | Stoic | wrote The Enchiridion, a handbook of Stoic ethical advice | 
| Epicurus |  | Epicurean | said that the purpose of philosophy was to attain tranquility characterized by ataraxia | 
| Eubulides |  | Megarian |  | 
| Euclid of Megara |  | Megarian |  | 
| Eudemus of Rhodes |  | Peripatetic |  | 
| Eudorus of Alexandria |  | Peripatetic |  | 
| Eudoxus of Cnidus | 410/408 – 355/347 BC | Academic Platonist |  | 
| Euenus |  | Sophist |  | 
| Euphantus |  | Megarian |  | 
| Euphraeus |  | 
| Euphrates |  | Stoic |  | 
| Eurytus |  | Pythagorean |  | 
| Eusebius of Myndus | fl. 4th century | Neoplatonic |  | 
| Eustathius of Cappadocia | c. 400 | Neoplatonic |  | 
| Evander | fl. c. 215 - c. 205 | Academic skeptic |  | 
| Favorinus |  | Academic skeptic |  | 
| Gaius the Platonist | fl. 2nd century | Middle Platonist |  | 
| Geminus |  | Stoic |  | 
| Gorgias |  | Sophist |  | 
| Hagnon of Tarsus | fl. 2nd century BC | Academic skeptic |  | 
| Hecataeus of Abdera |  | Pyrrhonist |  | 
| Hecato of Rhodes |  | Stoic |  | 
| Hegesias of Cyrene |  | Cyrenaic |  | 
| Hegesinus of Pergamon | fl. c. 160 BC | Academic skeptic |  | 
| Hegias | fl. c. 500 | Neoplatonic |  | 
| Heliodorus of Alexandria | fl. 5th century | Neoplatonic |  | 
| Heraclides Lembus |  | 
| Heraclides Ponticus | 387 - 312 BC | Academic Platonist |  | 
| Heraclitus |  | Presocratic, Ephesian | claimed that "You cannot step in the same river twice" and "All is fire." | 
| Heraclius |  | Cynic |  | 
| Herillus of Carthage |  | Stoic |  | 
| Hermagoras of Amphipolis |  | Stoic |  | 
| Hermarchus |  | Epicurean |  | 
| Hermias | born c. 410 - died c. 450 | Neoplatonic |  | 
| Herminus |  | Peripatetic |  | 
| Hermippus of Smyrna |  | Peripatetic |  | 
| Hermotimus of Clazomenae |  | 
| Hicetas |  | Pythagorean |  | 
| Hierius | fl c. 500 | Neoplatonic |  | 
| Hierocles of Alexandria | fl. c. 430 | Neoplatonic |  | 
| Hierocles (Stoic) | 2nd century CE | Stoic |  | 
| Hieronymus of Rhodes | c. 290 – c. 230 BC | Peripatetic |  | 
| Himerius |  | Sophist |  | 
| Hipparchia of Maroneia | fl. c. 325 BC | Cynic | Genus of butterflies, Hipparchia (butterfly), named after her | 
| Hippasus |  | Pythagorean |  | 
| Hippias |  | Sophist |  | 
| Hippo | 5th century BC | Presocratic |  | 
| Horus |  | Cynic |  | 
| Hypatia of Alexandria | born 350-370 – 415 | Neoplatonic |  | 
| Iamblichus | c. 245-c. 325 | Neoplatonic |  | 
| Ichthyas |  | Megarian |  | 
| Idomeneus of Lampsacus |  | Epicurean |  | 
| Ion of Chios |  | Pythagorean |  | 
| Isidore of Alexandria | fl. c. 475 | Neoplatonic |  | 
| Jason of Nysa |  | Stoic |  | 
| Lacydes of Cyrene | before 241 - c. 205 BC | Academic skeptic |  | 
| Leonteus of Lampsacus |  | Epicurean |  | 
| Leontion |  | Epicurean |  | 
| Leucippus |  | Presocratic, Atomist |  | 
| Lyco of Iasos |  | Pythagorean |  | 
| Lyco of Troas |  | Peripatetic |  | 
| Lycophron |  | Sophist |  | 
| Lysis of Taras |  | Pythagorean |  | 
| Marinus of Neapolis | born c. 450 | Neoplatonic |  | 
| Maximus of Ephesus | died 372 | Neoplatonic |  | 
| Maximus of Tyre | fl. 2nd century | Middle Platonist |  | 
| Meleager of Gadara |  | Cynic |  | 
| Melissus of Samos |  | Presocratic, Eleatic |  | 
| Menedemus |  | Eretrian |  | 
| Menedemus of Pyrrha | fl. c. 350 BC | Academic Platonist |  | 
| Menedemus the Cynic |  | Cynic |  | 
| Menippus |  | Cynic |  | 
| Metrocles |  | Cynic |  | 
| Metrodorus of Athens |  | 
| Metrodorus of Chios |  | Atomist |  | 
| Metrodorus of Cos |  | Pythagorean |  | 
| Metrodorus of Lampsacus (the elder) |  | Presocratic |  | 
| Metrodorus of Lampsacus (the younger) |  | Epicurean |  | 
| Metrodorus of Stratonicea | fl. 2nd century BC | Academic skeptic |  | 
| Mnesarchus of Athens |  | Stoic |  | 
| Moderatus of Gades |  | Neopythagorean |  | 
| Monimus |  | Cynic |  | 
| Myia |  | Pythagorean |  | 
| Nausiphanes |  | Atomist |  | 
| Nicarete of Megara |  | Megarian |  | 
| Nicolaus of Damascus |  |  |  | 
| Nicomachus |  | Neopythagorean |  | 
| Nicomachus (son of Aristotle) |  | Peripatetic |  | 
| Numenius of Apamea | fl. c. 275 | Neopythagorean |  | 
| Nymphidianus of Smyrna | fl. c. 360 | Neoplatonic |  | 
| Ocellus Lucanus |  | Pythagorean |  | 
| Oenomaus of Gadara |  | Cynic |  | 
| Olympiodorus the Elder |  | Peripatetic |  | 
| Olympiodorus the Younger | c. 495-570 | Neoplatonic |  | 
| Onasander | fl. 1st century | Middle Platonist |  | 
| Onatas |  | Pythagorean |  | 
| Origen the Pagan | fl. c. 250 | Middle Platonist |  | 
| Panaetius |  | Stoic |  | 
| Pancrates of Athens |  | Cynic |  | 
| Panthoides |  | Megarian |  | 
| Parmenides of Elea |  | Presocratic, Eleatic | held that the only thing that exists is being itself; teacher of Zeno of Elea | 
| Pasicles of Thebes |  | Megarian |  | 
| Patro the Epicurean |  | Epicurean |  | 
| Peregrinus Proteus |  | Cynic |  | 
| Persaeus |  | Stoic |  | 
| Phaedo of Elis |  | Eretrian | Originally founded the School of Elis; it was later transferred to Eretria by his pupil Menedemus. | 
| Phaedrus |  | Epicurean |  | 
| Phanias of Eresus |  | Peripatetic |  | 
| Phanto of Phlius |  | Pythagorean |  | 
| Philip of Opus | fl. 4th century BC | Academic |  | 
| Philiscus of Aegina |  | Cynic |  | 
| Philiscus of Thessaly |  | Sophist |  | 
| Philo | 20 BC - 50 AD | Middle Platonist |  | 
| Philo of Larissa | 159/158 – 84/83 BC | Academic skeptic |  | 
| Philo the Dialectician |  | Megarian |  | 
| Philodemus |  | Epicurean |  | 
| Philolaus |  | Pythagorean |  | 
| Philonides of Laodicea |  | Epicurean |  | 
| Philostratus |  | Sophist |  | 
| Phintys |  | Pythagorean |  | 
| Plato | 428/427 - 348/347 BC | Academic | student of Socrates and teacher of Aristotle; famous for the Theory of Forms | 
| Plotinus | c. 204 – 270 | Neoplatonic |  | 
| Plutarch | c. 46 – 120 | Middle Platonist |  | 
| Plutarch of Athens | c. 350 – 430 | Neoplatonic |  | 
| Polemarchus |  | 
| Polemon of Athens |  | Stoic |  | 
| Polemon of Athens (scholarch) | before 314 - 270/269 BC | Academic | 
| Polemon of Laodicea |  | Sophist |  | 
| Polus |  | 
| Polyaenus of Lampsacus |  | Epicurean |  | 
| Polystratus |  | Epicurean |  | 
| Porphyry | 234 – c. 305 | Neoplatonic | taught by Plotinus; wrote the Isagoge, an introduction to Aristotle's "Categories", | 
| Posidonius |  | Stoic |  | 
| Potamo of Alexandria |  | Eclecticism |  | 
| Praxiphanes |  | Peripatetic |  | 
| Priscian of Lydia | fl. c. 550 | Neoplatonic |  | 
| Priscus of Epirus | c. 305-c. 395 | Neoplatonic |  | 
| Proclus | 412 – 485 | Neoplatonic |  | 
| Proclus of Laodicea |  |  | 
| Proclus Mallotes |  | Stoic |  | 
| Prodicus |  | Sophist |  | 
| Protagoras |  | Sophist |  | 
| Ptolemy-el-Garib | fl. c. 300 AD | Peripatetic |  | 
| Pyrrho |  | Pyrrhonist | credited as being the first skeptic philosopher | 
| Pythagoras | c. 570 – c. 495 BC | Pythagorean | Credited with discovering the Pythagorean theorem | 
| Sallustius |  | Neoplatonic |  | 
| Sallustius of Emesa |  | Cynic |  | 
| Satyrus |  | Peripatetic |  | 
| Secundus the Silent |  | Cynic |  | 
| Sextus of Chaeronea |  | 
| Sextus Empiricus |  | Pyrrhonist |  | 
| Simmias of Thebes |  | Pythagorean |  | 
| Simon the Shoemaker |  | Socratic |  | 
| Simplicius of Cilicia | c. 490 - c. 560 | Neoplatonic |  | 
| Siro |  | Epicurean |  | 
| Socrates | c. 470–399 BC | Socratic | considered one of the founders of Western philosophy; credited as being the first moral philosopher | 
| Sopater of Apamea | died before 337 | Neoplatonic |  | 
| Sosigenes |  | Peripatetic |  | 
| Sosipatra | fl. c. 325 | Neoplatonic |  | 
| Sotion |  | Neopythagorean |  | 
| Speusippus | c. 407 – 339 BC | Academic |  | 
| Sphaerus |  | Stoic |  | 
| Stilpo |  | Megarian |  | 
| Strato of Lampsacus |  | Peripatetic |  | 
| Syrianus | died c. 437 | Neoplatonic |  | 
| Telauges |  | Pythagorean |  | 
| Telecles of Phocis | died 167/166 BC | Academic skeptic |  | 
| Teles the Cynic |  | Cynic |  | 
| Thales | c. 626/623  – c. 548/545 BC | Presocratic, Milesian | first philosopher; held that the first principle (arche) is water; one of the Seven Sages of Greece | 
| Theagenes of Patras |  | Cynic |  | 
| Theano |  | Pythagorean |  | 
| Themista of Lampsacus |  | Epicurean |  | 
| Themistius |  | Neoplatonic |  | 
| Theodorus of Asine | fl. 3rd century | Neoplatonic |  | 
| Theodorus the Atheist | c. 340 – c. 250 BCE | Cyrenaic |  | 
| Theon of Smyrna |  | Neopythagorean |  | 
| Theophrastus |  | Peripatetic |  | 
| Thrasymachus |  | Sophist |  | 
| Thrasymachus of Corinth |  | Megarian |  | 
| Timaeus of Locri |  | Pythagorean |  | 
| Timaeus the Sophist | fl. between 1st and 4th centuries | Middle Platonist |  | 
| Timon |  | Pyrrhonist |  | 
| Timycha |  | Pythagorean |  | 
| Tisias |  | Sophist |  | 
| Xenarchus of Seleucia |  | Peripatetic |  | 
| Xeniades |  | Pyrrhonist |  | 
| Xenocrates | c. 396 – 314 BC | Academic |  | 
| Xenophanes of Colophon |  | Presocratic, Eleatic | claimed that if oxen were able to imagine gods, those gods would be in the image of oxen | 
| Xenophilus |  | Pythagorean | friend and teacher of Aristoxenus | 
| Xenophon |  |  | 
| Zenobius | 2nd century A.D. | Sophist | flourished in the times of the emperor Hadrian | 
| Zenodotus | fl. c. 475 | Neoplatonic | described as "the darling of Proclus" | 
| Zeno of Citium | 334-262 BC | Stoic | founder of the Stoic school of philosophy | 
| Zeno of Elea |  | Presocratic, Eleatic | famous creator of Zeno's paradoxes | 
| Zeno of Sidon | 150-75 BC | Epicurean | sometimes termed the "leading Epicurean" | 
| Zeno of Tarsus | fl. 200 BC | Stoic |  |