Niels Erik Nørlund ForMemRS[1] (26 October 1885, in Slagelse – 4 July 1981, in Copenhagen) was a Danish mathematician.

[2][3][4] His book Vorlesungen über Differenzenrechnung (1924, reprinted 1954) was the first book on complex function solutions of difference equations.

His doctoral students include Georg Rasch.

[5] He was also the brother of Margrethe Nørlund Bohr and brother-in-law of Nobel Prize winning physicist Niels Bohr.

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