Ground

Units in Starcraft II are tagged with one or more Attributes that determine bonus damage, affect targeting, and/or can influence spells and abilities.

List of Ground units
The Ground units, categorized by race, are listed below:

Protoss

 * Probe
 * Zealot
 * Sentry
 * Stalker
 * Immortal
 * Colossus
 * High Templar
 * Dark Templar
 * Archon
 * Adept
 * Disruptor

Terran

 * SCV
 * MULE
 * Marine
 * Marauder
 * Reaper
 * Ghost
 * Hellion
 * Siege Tank
 * Thor
 * Viking (in Assault Mode)
 * Auto-Turret
 * Hellbat
 * Widow Mine
 * Cyclone

Zerg

 * Larva
 * Drone
 * Zergling
 * Queen
 * Baneling
 * Roach
 * Hydralisk
 * Changeling
 * Ultralisk
 * Infestor
 * Infested Terran
 * Broodling
 * Larva or Baneling Cocoon
 * Swarm Host
 * Locust
 * Ravager
 * Lurker

Protoss

 * Probe
 * Zealot
 * Sentry
 * Stalker
 * Dark Templar
 * Immortal
 * Colossus
 * Void Ray
 * Carrier (using Interceptors)
 * Mothership
 * High Templar (using Psionic Storm or Feedback)
 * Phoenix (but only if another one is using Graviton Beam)
 * Mothership Core
 * Oracle (using Pulsar Beam)
 * Tempest
 * Adept
 * Disruptor

Terran

 * SCV
 * Marine
 * Marauder
 * Reaper
 * Ghost
 * Hellion
 * Siege Tank
 * Thor
 * Banshee
 * Battlecruiser
 * Viking (in Assault Mode)
 * Raven (using Seeker Missile or Auto-Turret)
 * Hellbat
 * Widow Mine
 * Cyclone
 * Liberator

Zerg

 * Drone
 * Zergling
 * Queen
 * Baneling
 * Roach
 * Hydralisk
 * Mutalisk
 * Brood Lord
 * Broodling
 * Infestor (using Infested Terran or Fungal Growth)
 * Ultralisk
 * Swarm Host (using Locust)
 * Ravager
 * Lurker

Negative Spells and Abilities
This following spells have a negative effect on units with the attribute of Ground. Note that massive units (Ultralisks, Colossi, Archons, and Thors) are not affected by Force Field and Graviton Beam.