Kjell Hallbing (5 November 1934, in Bærum – 6 May 2004, in Tønsberg) was a Norwegian author of Western books.

Under the pseudonym Louis Masterson, he wrote a series of books about the fictitious Texas Ranger (and later U.S.

Earlier in his career Hallbing used the pseudonyms Ward Cameron, Leo Manning, Lee Morgan and Colin Hawkins.

The same year he released his first book set in the old West, Portrett av en revolvermann ("Portrait of a Gunslinger").

Other "heroes" Hallbing/Masterson wrote about included Jesse Rawlins, Owen Metzgar and Clay Allison.