Nechtan, Nectan or Neithon may refer to:

Kings:

• Nechtan Morbet (fl. 5th or 6th century), king of the Picts
• Nechtan nepos Uerb (fl. 7th century), king of the Picts
• Nechtan mac Der-Ilei (d. 732), king of the Picts
• Neithon of Alt Clut (fl. 7th century), King of Strathclyde

Other people:

• Nechtan of Aberdeen (fl. 12th century), bishop of Aberdeen
• Saint Nectan (fl. 5th/6th century), associated with Devon and Cornwall

Mythology:

• Nechtan Scéne, character in the Irish Ulster Cycle
• Nechtan (mythology), an Irish god
• Nechtan mac Collbran, Irish-mythological character in Voyage of Bran

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