Nechtan mac Der-Ilei or Nechtan mac Dargarto (OIr Nechtan mac Der-Ilei or Nechtan mac Dargarto) (before 686-732) is king of the Picts 706-724 and 728-729.
He succeeds his brother Bridei in 706.
He is associated with significant religious reforms in Pictland.
He abdicates in 724 in favor of his nephew and becomesa monk.
In 728–729, he fights in a four-sided war for the Pictish throne.