Rick's Group is a survivor group formed in Volume 1, led by Rick Grimes. The group was formed after Rick arrived at the Atlanta Survivor Camp, and became leader after with Shane's death. The group serves as the center of the story.
The Woodbury Army is a massive group of armed Woodbury citizens rounded together by The Governor to kill Rick Grimes' group in order to capture the Prison, as well as to satisfy his own hatred of the group.
A Herd, also known as a Horde, is a large group of zombies. They are usually attracted by sound, leading a few individuals to come together, eventually finding and merging with new groups, growing larger and larger and even more ferocious.
The Saviors are a large group of antagonistic survivors who were mentioned in "A Larger World" and first appeared in "Something To Fear". The Saviors use a large factory surrounded by a wall of impaled and tied zombies as their base.
The Militia is a coalition of people from the Alexandria Safe-Zone, Hilltop Colony, and The Kingdom all in alliance to fight Negan and The Saviors. It is later reformed years later to combat The Whisperers after they had killed several people from each of the communities.
The Whisperers are a mysterious group of survivors who disguise themselves with roamer skin to blend in with them and not get noticed. They are first introduced in Issue 130. They serve as the primary antagonistic group in Volume 24: Life And Death.
Rick's Group is a survivor group formed in Season 1, led by Rick Grimes. The group was formed after Rick arrived at the Atlanta Survivor Camp, and became leader along with Shane Walsh. The group serves as the center of the story.
The Living consists of a hostile group of scavengers and manipulators. There were at least 30 members before they came across Rick's Group. They serve as the secondary antagonists of the whole of Season 2.
The Woodbury army is a large, heavily armed group of survivors introduced in Season 3. They are based in the fortified town of Woodbury and led by the Governor. They serve as the primary antagonists of the whole of Season 3.
The Governor's militia was a group of about thirty survivors from Caesar Martinez's camp formed to take the West Georgia Correctional Facility from Rick Grimes's group. They serve as the primary antagonists during the first half of Season 4.
The Saviors are a vast organization of hostile survivors introduced in Season 6 The Walking Dead. They serve as the primary antagonists for the second half of Season 6, and the whole of Season 7 and Season 8.
Oceanside is a community that first appears in the episode "Swear". It is a community grounded in Maryland or Virginia that has situated in a pre-apocalypse campground, and is near a small beach. It is led by a woman named Natania and home to at least 85 people, despite 60 being present from the last appearance.
The Scavengers are a large group that first appears in the episode "Rock in the Road". They live in a Junkyard and are led by a woman named Jadis. They serve as the secondary antagonists of the second half of Season 7 and the first half of Season 8.
The Motel Survivors were survivors and the main characters of Telltale Games's, The Walking Dead. Originally the group stayed in the Everett Pharmacy Drugstore, until they transferred to the motel due to the available beds and the belief it was easily defendable. Lilly initially led the group, though Kenny and Lee soon became co-leaders after Lilly left/was exiled due to her overt paranoia (Determinant). When Kenny became depressed over the loss of his family, Lee became the sole leader.
The Save-Lots Bandits are a group of bandits in The Walking Dead: Season One. Their ranks are primarily composed of former workers from the Save-Lots store near Macon, Georgia and prey upon other groups of survivors, taking anything of value for their own use and killing anyone who gets in their way. They serve as the secondary antagonistic group of "Starved For Help" and the primary antagonists of "Long Road Ahead".
The Cabin Group were survivors and the main characters of The Walking Dead: Season 2. Originally the group were in a community led by William Carver, until they escaped because they saw Carver as a cruel leader.
Carver's Group is a group of survivors that was first encountered in "A House Divided" of The Walking Dead: Season Two. They have been hunting the Cabin Group in an attempt to bring the group back to their main base. It is assumed that they have a fairly violent nature, as they are feared by the cabin survivors. They are the primary antagonistic group in "A House Divided", "In Harm's Way", and the secondary antagonists of "Amid The Ruins".
The Russian Group are a group of survivors introduced in episode 4 "Amid The Ruins " of The Walking Dead: Season Two. They ambushed Clementine's group, and began the shoot-out. Despite their short appearance, they serve as the primary antagonistic group in "Amid The Ruins" and "No Going Back".
The Monroe Colonists are a group of survivors that were first encountered in "In Too Deep" of The Walking Dead: Michonne. They were led by Norma, and lived in Monroe. They are the primary antagonistic group in "In Too Deep", "Give No Shelter", and "What We Deserve".
The California Army National Guard is the land force component of the California National Guard, one of the reserve components of the United States Army, and is part of the National Guard of the United States.
Connor's Pirates are a group of survivors introduced in the episode "Blood in the Streets" in Season 2 Fear The Walking Dead. They boarded and hijacked The Abigail, as well as held Travis and Alicia hostage. They are the secondary antagonists of the first half of Season 2.
Brandon's Group is a group of young men from San Diego. Initially the group was made up of Brandon, Derek, James McCallister and Troy; they were on holiday in Mexico when the border closed and then the country fell. Brandon is the leader of the group.
The Vultures are a group of hostile survivors introduced in Season 4 of AMC's Fear The Walking Dead. They are led by a man named Melvin and serve as the primary antagonists of the first half of Season 4.