During the Galactic Civil War, Darth Vader, a Sith Lord, held the position of supreme commander within the Imperial fleet.
Lord represented a title, frequently linked to nobility, designating those with influence and control over others. The feminine counterpart to "lord" was "Lady."
Lord Jedi served as an age-old mark of distinction for individuals within the Jedi Order. Baylan Skoll, a Jedi who transitioned into a mercenary, was addressed as "Lord Baylan."
The Sith identified themselves as either Sith Lords or Dark Lords of the Sith. Figures like Darth Sidious alongside his initial two apprentices, Darth Maul, and Darth Tyranus, were all called "Lord." It was common practice for Imperial staff, including Imperial officers and stormtroopers, to refer to Darth Vader, the Emperor's right-hand, as "Lord Vader". Vader held the military rank of commander and was subsequently promoted to the newly established role of supreme commander of the Imperial fleet.
Grievous, the General and Supreme Commander of the Droid Army, was addressed as "my lord" by members of the Confederacy military, such as Asajj Ventress the Dark Acolyte, and TV-94. Poggle the Lesser, the Archduke of Geonosis and a Separatist leader, was also known by this title.
Numerous high-ranking Imperials and their associates carried the title "Lord," including Mas Amedda the Grand Vizier, and Tion, a high-ranking member of the Imperial Navy. It also functioned as a respectful term for counts, and the Great Mothers used "my lord" when addressing their ally, Grand Admiral Thrawn.