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Battle of Ballast
Conflict:	Human-Covenant War
Date:	2551 or 2552
Location:	Ballast
Outcome:	Unknown, possibly a UNSC Victory
Belligerents United Nations Space Command Covenant Commanders Unknown Unknown Strength Unknown Unknown Casualties Unknown Unknown

The Battle of Ballast was a battle that took place on the UNSC colony of Ballast during the Human-Covenant War. It is unclear if the UNSC or Covenant forces on the planet won the battle, but propaganda produced by ONI stated that the battle was a UNSC victory. Signs on the Quito Space Tether hint that the colony still existed during the Battle for Earth.

The marine battalion E2-BAG/1/7 was involved in the battle and afterwards provided feedback on munitions used as part of a study entitled Machines, Materiel and Munitions from the Human-Covenant Conflict, 2525 - Present.