Necho I (sometimes Nekau) (672 BCE–664 BCE) is the prince or governor of the Egyptian city of Sais.

He is the first attested local Saite king of the twenty-sixth dynasty of Egypt who reigned for ight years, according to Manetho's Epitome.

Egypt is reunified by his son, Psamtik I. Necho I is primarily known from Assyrian documents but is now also attested in one contemporary Egyptian document from his reign.

He is officially "installed" at Sais by Assurbanipal around 670 BCE, but he already ruled Egypt as a local king prior to this event.

According to historical records, Necho I was killed by an invading Kushite force in 664 BCE under Tantamani for being an ally of Assyria.

The Nubian invasion into the Egyptian Delta is subsequently repelled by the Assyrians who proceed to advance south into Upper Egypt and sack Thebes.