Rebel

Rebels are any group that wants to break away from a primary government. "Rebel" may refer to...

In the UNSC
 * Frieden Rebels, a secessionist faction that fought against the UN in the Interplanetary War


 * Koslovic Rebels, the neo-Communist faction that fought against the UN in the Interplanetary War


 * United Rebel Front, the larger faction of human rebels united against the UNSC government.
 * Eridanus Rebels, the faction of human rebels in the Eridanus System
 * Secessionist Union, a rebel union on Harvest led by Jerald Mulkey Ander.
 * Insurrectionists, a rebel group on Tribute, possibly connected to the Secessionist Union.

In the Covenant
 * The Heretics, the breakaway faction that follows Sesa 'Refumee and is against the Great Journey.
 * Covenant Separatists The Elite led faction after they learned the truth about halo.
 * The Grunt Rebellion A Grunt uprising against the rest of the Covenant which led to the creation of an Arbiter.