ST Action was a video game magazine published in the UK during the late 1980s and early 1990s that covered the Atari ST, platform. Some coverage was also given to the Atari Lynx and Atari Jaguar in the later stages of its life, although this was limited to the news section.

ST Action was launched in April 1988 by Gollner Publishing Ltd., becoming the first dedicated games magazine for the 16-bit Atari platform. The original team included Hugh Gollner (Publisher), Nick Clarkson (Editor), Steve Merrett, Jason Spiller and Martin Moth (Writers), Greg Percvial (Design). In 1990, Gollner Publishing merged with Europress Interactive, and ST Action made the transition to Europress, under which it would be published for the remainder of its lifespan. During this time, ST Action also proved a useful training ground for a number of gaming journalists including Doug Johns, Paul McNally, Jason Dutton, Alan Bunker and Steve White.

The magazine is remembered for pioneering the use of digital technology to capture game screenshots, becoming the first video game magazine in the world to do so. Games magazines traditionally took screenshots using a camera positioned in front of the screen. Ian Tindale found that he could use Mac-based technology to perform the image capture, saving time and cost.

The number of game releases for the Atari ST slowed during 1992, resulting in a decrease from 100 pages in the January 1992 edition to 76 pages in the December 1992 issue. The majority of issues published in 1993 contained 68 pages, the majority of which were dedicated to re-released games and regular content (news, letters, tips, help guides, subscription, etc.). The final issue (#67, November 1993) was published in October 1993, after which it was incorporated into Atari ST User.

ST Action served as the games section for Atari ST User for several issues until Atari ST User was closed in November 1994. It was subsequently adopted by Atari ST Review with the December 1994 edition and continued until its closure