Kieron Michael Gillen (/ˈɡɪlən/; born 30 September 1975)[3] is a British comic book writer and former video game and music journalist.

In comics, Gillen is known for his creator-owned series such as Once & Future (2019–2022), Die (2018–2021), Phonogram (2006–2016), and The Wicked + The Divine (2014–2019), the latter two co-created with artist Jamie McKelvie and published by Image.

He returned to the X-Men in the 2020s with multiple series during the Krakoan Age for the Destiny of X, Sins of Sinister and Fall of X storylines.

In addition to his work as a reviewer, Gillen has acted as a guest speaker at numerous video game industry conferences.

[12][13] In a September 2010 post at Rock Paper Shotgun, Gillen announced he was leaving full-time video game journalism to devote his time to comic book writing.

[20] On 14 April 2008, it was announced Gillen would collaborate with artist Greg Scott to expand on Warren Ellis' newuniversal series with "a story about killing the future" set in 1959.

[22][23] Further Marvel assignments included a Dazzler short story and a Beta Ray Bill one-shot, which was followed by a three-issue mini-series.

[29] In late 2010, Gillen launched another X-Men spin-off Generation Hope that picked up plot threads from the end of the "Second Coming" storyline.

After finishing his run with issue #20, Gillen penned a five-issue epilogue miniseries AvX: Consequences that dealt with the aftermath of that event.

relaunch, Gillen wrote two books: Iron Man (again taking over from Fraction) with art by his frequent Uncanny X-Men collaborator Greg Land, and Young Avengers with Jamie McKelvie.

[44][45][15] ComicsAlliance highlighted that there was a three year delay between the volume announcement and its release "as everyone involved had rightly become superstars, but it was more than worth the wait".

GamesRadar+ highlighted that they "have worked together on-and-off for the past 17 years" and that the Batman short story was their "first major project together since the conclusion of The Wicked + The Divine in 2019".

[87][88][89] At Emerald City Comic Con 2024, Gillen announced a new Image series titled The Power Fantasy with artist Caspar Wijngaard and letterer Clayton Cowles; it is scheduled to release in August 2024.

[90][92] Gillen was awarded an honorary Doctorate of Arts by Staffordshire University in 2019 for his work both as a journalist and a comic book writer.