Nagell is a surname.
Notable people with this surname include: Richard Case Nagell, former military officer who claimed to have had foreknowledge of the John F. Kennedy assassination Tinius Nagell-Erichsen (1934–2007), Norwegian publisher, noted for his leadership of the Schibsted media conglomerate Trygve Nagell (1895–1988), Norwegian mathematician, known for his works on the Diophantine equations within number theory
See also Nagell–Lutz theorem, in mathematics Ramanujan–Nagell equation, in mathematics