The Union is a UK superhero team that appears in comic books published by Marvel comics. The Union debuted in the crossover event called King in Black alongside other well known Marvel heroes. The team faced off against both known and new foes not yet fought by any Marvel superhero or team.

The Union is a five issue mini series that first appeared in December 2020 with Union #1. The Union was originally due to be released as a part of the "Empyre" event, but was moved and rewritten to fit into the "King in Black" event due to issues caused by the COVID-19 pandemic.

On December 2, 2020, The Union appeared in The Union #1 as part of the King in Black crossover event.

On 29 September 2021, The Union appeared in Marvels #5.

On 15 May 2024 The Union appeared in Union Jack the Ripper: Blood Hunt #1-3 with Bulldog featuring as a supporting character.

The Union was formed by the British government as publicity attempt to restore faith in the UK. The team's formation is funded by billionaire Steve Darwin and was the dream of Britannia who wished to see super-powered representatives from across the UK serve Queen and country.

The members, while representing different parts of the UK have to work together to face a variety of enemies. These including Knull, Doc Croc, Sponge, assorted vampires, and Baron Blood. The Union under the leadership of Britannia has protected the nation and united the super-powered heroes of its past and future

The Union (Marvel team) roster has gone through a number of changes, this includes members leaving and joining the team and being present in a spirit form. Current member are indicated in bold. Leaders are highlighted in gold