Capital ship

Capital Ships are the most important and largest warships; the ones with the heaviest firepower and armor. There is usually no formal criterion for the classification, but it is a useful concept when thinking about strategy, for instance to compare relative naval strengths in a theater of operations without having to get bogged down in the details of tonnage and gun variants. A capital ship is generally a leading or primary ship in a fleet, battlegroup, or Strike Force.

Forerunner

 * Dreadnought

Covenant
These are the classifications of Covenant warships known to fall under the Capital Ship category:
 * Covenant Assault Carrier
 * CCS-class Battlecruiser
 * Covenant Supercruiser
 * Covenant Battleship

UNSC
These are the classifications of UNSC Warships known to fall under the Capital Ship category:
 * Marathon-class Cruiser
 * Halcyon-class Cruiser
 * UNSC Carrier
 * UNSC Supercarrier