Harold Norling Swanson (August 28, 1899 – May 31, 1991) was a literary agent who represented Frank Buck, F. Scott Fitzgerald and many other well-known American writers.

Swanson's efforts led to Buck's first appearance in a dramatic role, in the 15-chapter serial Jungle Menace, released by Columbia Pictures in 1937.

The Swanson Agency was unique at that time in its exclusive focus on the sale of motion picture (and later television and radio) rights to literary properties, as well as representation of the writers (including screenwriters) themselves.

His dominance in this area is illustrated by the fact that by 1939 his client list reportedly included 80 of the 110 writers then working for Twentieth Century Fox.

At one time or another, he represented F. Scott Fitzgerald, James M. Cain, William Faulkner, Ernest Haycox, Katharine Brush, Frank Gruber, Paul Gallico, Charles Bennett, MacKinlay Kantor, Kenneth Millar (Ross Macdonald), Pearl Buck, Raymond Chandler, Steve Fisher, Elmore Leonard, John O'Hara, Luke Short (Frederick Glidden), Joyce Carol Oates, Paul Theroux, Joseph Wambaugh, Philip Wylie and Cornell Woolrich.