Journal of the Travellers Aid Society is a role-playing game magazine devoted to Traveller, commonly abbreviated JTAS. The first issue was published by GDW in 1979 and the last of the first run was #24 in 1985. It was superseded by the magazine Challenge, which took up its numbering scheme and ran from issue 25 onwards with a broader role-playing game focus.

The magazine was revived by Imperium Games after GDW folded, and JTAS 25 and 26 were published before that publisher folded itself.

After Steve Jackson Games licensed the Traveller setting, JTAS was revived once again as a weekly, then bi-weekly subscriber-supported web magazine in February, 2000. This incarnation of JTAS can be found at http://jtas.sjgames.com