Guthorm Hallager (1864-1932) was a Norwegian civil servant and lawyer.
[1] He was the son of law professor and Supreme Court judge Georg Frederik Hallager.
In 1888, he became deputy magistrate and later became the town clerk in Kragerø.
[2] Hallager became friends with Alexander Kielland after the town fire in Ålesund.
Some of the letters between them were recorded in the book, Amtmanden og Expeditionschefen : brev fra Alexander L. Kielland til Guthorm Hallager.