The Gem (1907–1939) was a story paper published in Great Britain by Amalgamated Press in the early 20th century, predominantly featuring the activities of boys at the fictional school St. Jim's.

These stories were all written using the pen-name of "Martin Clifford," the majority by Charles Hamilton (who was more widely known as "Frank Richards," the creator of Billy Bunter).

Many issues also included a shorter serial story (a variety of detective, school, and adventure yarns were featured); these parts of the paper were not written by Charles Hamilton.

The most famous St Jim's characters were Tom Merry and Arthur Augustus D'Arcy, better known as Gussy, both of whom featured on many of the covers.

Following a suggestion by Eric Fayne (who was a headmaster and a Charles Hamilton enthusiast) in 1931, The Gem started reprinting the early stories, beginning with the arrival of Tom Merry at St Jim's in issue 1221.