《斐多篇》是柏拉图的第四篇对话录，内容为苏格拉底饮下毒药前的对话。斐多篇当中的叙事者为斐多，一个曾受过苏格拉底帮助的年轻人并成为其弟子，在苏格拉底死亡当年亦跟随在他身旁。斐多的对话对象为弗里乌斯的伊奇，一个同是哲学家的朋友。 在对话中，苏格拉底从多方面试图证明人灵魂的存在。

Phædo or Phaedo (/ˈfiːdoʊ/; Greek:Φαίδων, Phaidōn, Greek pronunciation: [pʰaídɔːn]), also known to ancient readers as On The Soul, is one of the best-known dialogues of Plato's middle period, along with the Republic and the Symposium. The Phaedo, which depicts the death of Socrates, is also Plato's fourth and last dialogue to detail the philosopher's final days, following Euthyphro, Apology, and Crito.