Rebel may refer to:
- 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.
- Insurrectionists: The general name for rebels during the Insurrection.
- Secessionist Union: A rebel union on Harvest led by Jerald Mulkey Ander.
- Unnamed Rebel Group: An unknown rebel group that resides on Harvest and Arcadia.
- United Rebel Front: The larger faction of human rebels united against the UNSC government.
- New Colonial Alliance: A rebel group that formed in the aftermath of the Human-Covenant war.
- Sesa 'Refumee's separatist faction: A breakaway faction that follows Sesa 'Refumee and rejects the Covenant's belief in the Great Journey.
- Covenant Separatists: An Elite-led faction that fought against the Covenant, after the Great Schism ejected them from the hegemony.
- Unggoy Rebellion: A Grunt-led uprising against the rest of the Covenant which led to the creation of an Arbiter.
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