The 2005 IDW continuity is the storyline of IDW Publishing's Generation 1 reboot comic book series, launched in 2005 and running until 2018. It re-imagined the traditional Autobot-DecepticonGreat War as a galaxy-spanning conflict, with Cybertron abandoned as a dead husk and teams from both sides covertly operating on various alien worlds to defend or destroy the native populations—including Earth.

Later stories abandoned the cloak-and-dagger conflict in favor of a more traditional take on the Cybertronian war, before ending the war entirely. While early stories stuck to a small cast focusing mostly on the more-familiar 1984 characters, as the universe progressed its scope slowly expanded to cover more and more characters and concepts from late "Generation 1" and beyond. In addition to adapting characters from other continuities (such as Knock Out and Blackarachnia), authors felt free to introduce entirely new characters (such as Drift, Rung, Windblade, and Aileron) with substantive roles. Many new minor characters were also included throughout the series.

A 2016 retcon/expansion established that this continuity was part of the shared Hasbro Universe; two years later it was brought to an end with a climactic battle against Unicron before IDW debuted its rebooted Transformers continuity the next year.

Having run almost continuously for 13 years in some form or another, IDW's first Transformersuniverse is one of the largest and most developed Transformers continuities. Many of the plots and character arcs from "Phase 2" onward earned widespread praise from both devoted Transformersfans and the broader comic book/science fiction industries.