Trygve Nagell (1895 – 1988) was a Norwegian mathematician, known for his works on the Diophantine equations within number theory.[1] He received his doctorate at the University of Oslo in 1926, and lectured at the University until 1931. He was a professor at the University of Uppsala from 1931 to 1962.[2] Nagell was appointed Commander of the Royal Norwegian Order of St. Olav in 1951, and of the Swedish Order of the Polar Star in 1952.[1]