The Thalassian Army is the standing military of the Kingdom of Quel'Thalas. The Thalassian army is primarily made up of the organization known as the Farstriders and has been led by a Ranger-General for hundreds, if not thousands, of years. When the Scourge invaded Quel'Thalas, most of the army was shattered, including the at the time Ranger-General, Sylvanas Windrunner.

The army later reformed under the new Ranger-General, Lor'themar Theron, who later was appointed Regent Lord of Quel'Thalas. After his appointment, Lor'themar handed the title off to his friend and colleague Halduron Brightwing, who continues to act as the current Ranger-General. With the betrayal and later defeat of Kael'thas Sunstrider and the destruction of the House of Sunstrider, Kael'thas' largest force, The Sunfury, rejoined Quel'Thalas as soon as Kael'thas betrayed the sin'dorei for the Legion. It has been stated that with the additional forces, the elves have been able to better defend their borders.

The Thalassian Military is broken up into four major branches:

Other forces also aligned to the Thalassian Military, such as the following: