| Name | Speaker | Mentioned |
| Adeimantus of Collytus, son of Ariston | Parmenides, Republic | Apology |
| Agathon of Athens, son of Tisamenus | Symposium | Protagoras; Epigram 6 |
| Alcibiades of Scambonidae, son of Clinias | Alcibiades, II Alcibiades, Protagoras, Symposium | Euthydemus, Gorgias |
| Antiphon of Athens, son of Pyrilampes | Parmenides | |
| Anytus of Euonymon, son of Anthemion | Meno | Apology |
| Apollodorus of Phalerum | Symposium | Apology, Phaedo |
| Aristides of Alopece, son of Lysimachus | Laches, Theages | Theaetetus |
| Aristodemus of Cydathenaeum | Symposium | |
| Aristophanes of Cydathenaeum, son of Philippus | Symposium | Apology; Epigram 18 |
| Aristotle of Thorae, son of Timocrates | Parmenides | |
| Aspasia of Miletus, daughter of Axiochus | Menexenus | |
| Axiochus of Scambonidae, son of Alcibiades | Axiochus | Euthydemus |
| Callias of Alopece, son of Hipponicus | Apology, Protagoras | Axiochus, Cratylus, Eryxias, Philebus, Protagoras, Theaetetus |
| Callicles of Acharnae | Gorgias | |
| Cebes of Thebes | Phaedo | Crito; Epistle XIII |
| Cephalus of Clazomenae | Parmenides | |
| Cephalus of Syracuse, son of Lysanias | Republic | Phaedrus |
| Chaerephon of Sphettus | Charmides, Gorgias, Halcyon | Apology |
| Charmides of Athens, son of Glaucon | Charmides, Theages | Axiochus, Protagoras, Symposium |
| Clinias of Cnossos | Epinomis, Laws | |
| Clinias of Scambonidae, son of Axiochus[1] | Axiochus, Euthydemus | |
| Clitophon of Athens, son of Aristonymus | Clitophon, Republic | |
| Cratylus of Athens, son of Smicrion | Cratylus | |
| Critias of Athens, son of Callaeschrus[2] | Charmides, Protagoras | Eryxias |
| Critias of Athens, son of Leaides[2] | Critias, Timaeus | |
| Crito of Alopece | Crito, Euthydemus, Phaedo | Apology |
| Ctesippus of Paeania | Euthydemus, Lysis | Phaedo |
| Demodocus of Anagyrus | Theages | Apology, Demodocus |
| Dionysodorus of Chios and Thurii | Euthydemus | |
| Diotima of Mantinea | Symposium | |
| Echecrates of Phlius | Phaedo | |
| Erasistratus of Athens | Eryxias | |
| Eryxias of Steiria | Eryxias | |
| Eryximachus of Athens, son of Acumenus | Symposium | Phaedrus, Protagoras |
| Euclides of Megara | Theaetetus | Phaedo |
| Eudicus of Athens, son of Apemantus | (Lesser) Hippias | (Greater) Hippias |
| Euthydemus of Chios and Thurii | Euthydemus | Cratylus |
| Euthyphro of Prospalta | Euthyphro | Cratylus |
| Glaucon of Collytus, son of Ariston | Parmenides, Republic, Symposium[3] | |
| Gorgias of Leontini, son of Charmantides | Gorgias | Apology, (Greater) Hippias, Meno, Phaedrus, Philebus, Symposium, Theages |
| Hermocrates of Syracuse, son of Hermon | Critias, Timaeus | |
| Hermogenes of Alopece, son of Hipponicus | Cratylus | Phaedo |
| Hippias of Elis, son of Diopeithes | (Greater) Hippias, (Lesser) Hippias, Protagoras | Apology, Phaedrus, Protagoras |
| Hippocrates of Athens, son of Apollodorus | Protagoras | |
| Hippothales of Athens, son of Hieronymus | Lysis | |
| Ion of Ephesus | Ion | |
| Laches of Aexone, son of Melanopus | Laches | Symposium |
| Lysias of Thurii and Athens, son of Cephalus | Phaedrus | Clitophon, Phaedrus, Republic |
| Lysimachus of Alopece, son of Aristides | Laches | Meno, On Virtue, Theaetetus, Theages |
| Lysis of Aexone, son of Democrates | Lysis | |
| Megillus of Sparta | Laws | Epinomis |
| Melesias of Alopece, son of Thucydides | Laches | Meno, On Virtue, Theages |
| Meletus of Pithus, son of Meletus | Apology | Euthyphro, Theaetetus |
| Menexenus of Athens, son of Demophon | Lysis, Menexenus | Phaedo |
| Meno of Pharsalus, son of Alexidemus[4] | Meno | |
| Nicias of Cydantidae, son of Niceratus | Laches | Gorgias, Republic, Theages |
| Parmenides of Elea, son of Pyres | Parmenides | Sophist, Symposium, Theaetetus |
| Pausanias of Cerameis | Symposium | Protagoras |
| Phaedo of Elis | Phaedo | |
| Phaedrus of Myrrhinus, son of Pythocles | Phaedrus, Symposium | Protagoras; Epigram 4 |
| Philebus | Philebus | |
| Polemarchus of Thurii, son of Cephalus | Republic | Phaedrus |
| Polus of Acragas | Gorgias | Phaedrus, Theages |
| Prodicus of Ceos | Eryxias, Protagoras | Apology, Axiochus, Charmides, Cratylus, Eryxias, Euthydemus, (Greater) Hippias, Laches, Phaedrus, Protagoras, Republic, Symposium, Theaetetus, Theages |
| Protagoras of Abdera | Protagoras, Theaetetus | Cratylus, Euthydemus, (Greater) Hippias, Laws, Phaedrus, Republic, Sophist, Theaetetus |
| Protarchus of Athens, son of Callias | Philebus | |
| Pythodorus of Athens, son of Isolochus | Parmenides | Alcibiades |
| Simmias of Thebes | Phaedo | Crito, Phaedrus; Epistle XIII |
| Sisyphus of Pharsalus[5] | Sisyphus | |
| Socrates of Alopece, son of Sophroniscus | Dialogues of Plato | Epistles II, VII, XIII |
| Socrates of Athens | Statesman | Sophist, Theaetetus; Epistle XI[6] |
| Terpsion of Megara | Theaetetus | Phaedo |
| Theaetetus of Sunium, son of Euphronius | Sophist, Theaetetus | Statesman |
| Theages of Anagyrus, son of Demodocus | Theages | Apology, Republic |
| Theodorus of Cyrene | Sophist, Statesman, Theaetetus | |
| Thrasymachus of Chalcedon | Republic | Clitophon, Phaedrus |
| Thucydides of Alopece, son of Melesias | Laches | Theages |
| Timaeus of Epizephyrian Locris | Critias, Timaeus | |
| Timarchus | Theages | |
| Xanthippe, wife of Socrates of Alopece | Phaedo | Halcyon; Epigram 8[7] |
| Zeno of Elea | Parmenides | Alcibiades, Sophist |