Sonchis of Saïs, also known as the Saïte (Ancient Greek: Σῶγχις ὁ Σαΐτης, Sō̂nkhis o Saḯtēs), was an Egyptian priest who lived around 594 BC. He is mentioned in Greek writings for sharing a story about Atlantis. Historians debate whether he was a real person or a figure from legend.

In Plato’s dialogues Timaeus and Critias, written about 360 BC, the story is told through the character Critias. It describes how the Athenian leader Solon (638–558 BC) visited Egypt and met priests of the goddess Neith in the city of Sais. An elderly priest told Solon that 9,000 years earlier, Athens had fought against the powerful civilization of Atlantis, which was later destroyed by a disaster.

Plato’s writings do not name the priest. However, the Roman writer Plutarch (46–120 AD), in his book Life of Solon, identified the old priest as Sonchis of Saïs.

In another work, On Isis and Osiris, Plutarch describes how several Greek philosophers visited Egypt and spoke with Egyptian priests. These philosophers included Thales of Miletus, Eudoxus of Cnidus, Solon, Pythagoras, and possibly Lycurgus of Sparta and Plato. Each philosopher met a different priest: Eudoxus spoke with Chonupheus of Memphis, Solon with Sonchis of Saïs, and Pythagoras with Oenuphis of Heliopolis.