Nechtan mac Der-Ilei or Nechtan mac Dargarto (Old Irish Nechtan mac Der-Ilei or Nechtan mac Dargarto) (before 686–732) was king of the Picts 706–724 and 728–729. He succeeded his brother Bridei in 706. He is associated with significant religious reforms in Pictland. He abdicated in 724 in favour of his nephew and became a monk. In 728 and 729 he fought in a four-sided war for the Pictish throne.