'Undead' refers mainly to the Scourge, although the Forsaken used mainly Scourge units in Warcraft III (although these two are NOT allies, they are bitter enemies and are played).'Orc' refers to Thrall's new Horde, which includes the orcs under Thrall, the jungle trolls of the Darkspear tribe, the Bloodhoof tauren, and the wyverns of the Stonetalon Mountains.'Human' refers to the Alliance of Lordaeron, which includes the humans of Lordaeron, high elves, blood elves, Bronzebeard dwarves and Wildhammer dwarves atop the gryphons of Aerie Peak.

Note that in Warcraft III the playable races actually referred to factions, and that many other races are included within this playable race. 'Special' is usually a summonable or upgraded unit ( Spirit Wolf or Berserker). 'Campaign' units often vary from the description of the group ( Undead Scourge, for example, has a Pit Lord listed under it). 'Campaign' means the unit is not a standard unit and is only found in the campaign and custom maps, while 'Melee' means it is a standard unit. This is a list of Warcraft III units from Warcraft III: Reign of Chaos and Warcraft III: The Frozen Throne. This article or section contains lore taken from Warcraft III: Reign of Chaos, Warcraft III: The Frozen Throne, the manuals, and official bonus maps.