The Lord Commander is a rank found in several of the Seven Kingdoms' institutions. It is a combination of "Lord", meaning that the person holding the title is of noble birth, or at the very least knighted, and "Commander", indicating a position of authority and leadership. The term may refer to:

• The Lord Commander of the Kingsguard, the elite group of seven knights whose duty it is to protect the King and the royal family. The Kingsguard's current Lord Commander is Ser Jaime Lannister. He took over the role when Ser Barristan Selmy was dismissed. Ser Duncan the Tall was Lord Commander when Selmy rose to prominence.

• The Lord Commander of the Night's Watch, the order responsible for defending the Wall. The last Lord Commander was Jeor Mormont, former Lord of Bear Island. Following Mormont's death, the position is vacant.

The leader of the City Watch of the Seven Kingdoms' various cities is a "Lord Commander" when of noble birth, or a "Commander" when not. Janos Slynt was merely a "Commander" due to his lack of noble birth, but was later elevated to the nobility as Lord of Harrenhal in gratitude for his service to King Joffrey in betraying Eddard Stark.

Ser Loras Tyrell briefly served as Lord Commander of Renly Baratheon's Kingsguard until the group's disbandment following Renly's assassination.