Tank

A tank is an armored fighting vehicle designed for either front-line combat, such as a main battle tank (MBT), or for combat support, which combines operational mobility and tactical offensive and defensive capabilities.

Main battle tanks

 * M808 Scorpion Main Battle Tank - The UNSC Armed Forces' main battle tank.
 * M808B Scorpion - A common model of the M808 MBT equipped with a coaxial M247T Medium Machine Gun in lieu of the M808's pintle-mounted version.
 * M808B2 Sun Devil: A variant of the M808B armed with four 40mm autocannons.
 * M808B3 Tarantula: A variant of the M808B armed with twin Scimitar 4x178mm rocket pods.
 * M808S Scorpion - An M808 Scorpion utilized by the UNSC Spirit of Fire, modified by Serina.
 * Lockdown Scorpion - An M808S Scorpion variant affixed with a bulldozer blade and equipped with energy shielding.
 * M820 Scorpion Main Battle Tank - The UNSC Armed Forces' successor to the M808 Scorpion.
 * Corp Scorpion - An M820 variant utilized by Liang Dortmund.
 * Tundra Scorpion - An M820 variant with tundra camouflage and heavier armor.
 * Urban Scorpion - An M820 variant with urban camouflage, utilized by the UNSC Army and Marine Corps against urbanized Insurrectionist forces.
 * ONI Scorpion - A Scorpion used by the Office of Naval Intelligence.
 * XM820B4 Scorpion - A Scorpion manufactured by Hannibal Weapon Systems, utilizing directed-energy weapons.
 * M850 Grizzly Main Battle Tank - A less common, more heavily armed and armored main battle tank.

Support tanks

 * SP42 Cobra Main Battle Tank - A light, wheeled railgun-armed vehicle used for anti-armor/anti-fortification support, despite its designation as a main battle tank.
 * M9 Wolverine Main Anti-Aircraft Tank - Primary UNSCDF anti-aircraft support vehicle; designated as a tank due to chassis design, not combat role.
 * M145D Rhino Mobile Artillery Assault Platform - A prototype platform armed with the Zeus 320mm plasma cannon, reverse engineered from Covenant technology.

Covenant

 *  - The Covenant's primary battle tank and mobile artillery platform.
 * Honor Guard Wraith - A Wraith tank utilized by the Covenant's Honor Guard.
 *  - Covenant Wraith used in the final months of the Human-Covenant War.
 *  - An anti-air variant of the Wraith armed with several Class-2 fuel rod cannons instead of the standard plasma mortar.
 *  - The successor to the Zurdo-pattern Wraith, used by the Swords of Sanghelios and other Covenant remnants.
 * Sword Wraith - A Kemu-pattern Wraith used by the Swords of Sanghelios.
 * Ultra Wraith - An upgraded Kemu-pattern Wraith with improved armor and firepower.
 * Temple Wraith - A masterwork Wraith with improved handling and increased rate of fire.
 *  - A Wraith variant optimized for combating aerial targets.

Banished

 * Eklon'Dal Workshop Marauder - A light Banished vehicle described as a medium tank.
 * Prowling Marauder - Marauder featuring cloaking, employed by Let 'Volir.
 * Marauder Warchief - Modified Marauder employed by Decimus.
 * Eklon'Dal Workshop Wraith - A variant of the Covenant Wraith, modified by the Banished.
 * Wraith Invader - A modified Banished Wraith utilized by Pavium.
 * Ironclad Wraith - A Banished Wraith with more armor and upgraded firepower.
 * Terror Wraith - A Banished Wraith utilized by Voridus, capable of firing infusion gel.
 * Bolroci Workshop Wraith - A Banished Wraith, utilized during their activities on Installation 07.

Forerunner

 * Forerunner Tank - A proposed vehicle for Halo: Combat Evolved and Halo 2.

Other uses of the term

 * Flood tank form - A Flood pure form derived from a mutating stalker form.
 * Forerunner Tank - A scrapped level from Halo 2.
 * Methane tank - A methane container used by the Unggoy to breathe in non-methane rich environments.