A queen denoted a female sovereign in a monarchy, while a king held the equivalent role for males.
On Naboo, the planet's leader was the queen, who attained her position through election. Notable figures who reigned as Queen of Naboo included Yram, Réillata, Sanandrassa, Padmé Amidala, Jamillia, Neeyutnee, Apailana, Dalné, and Sosha Soruna.
Various other planets, such as Alderaan, Bardotta, Hynestia Prime, Ktath'atn, Livorno, Rendel, Sarka, Aeos Prime, and Zygerria, also featured monarchies headed by queens in some capacity.
During the High Republic Era, the world of Eiram was governed by a Queen Regnant along with her spouse, the Queen Consort, at least twice. While the Queen Regnant held the true power, the Queen Consort often took on separate governmental responsibilities, such as acting as an advisor or diplomat.
During the era of the Clone Wars, Queen Miraj Scintel ruled Zygerria and its slave empire until her death at the hands of Count Dooku. Simultaneously, Queen Julia held dominion over Bardotta.
Breha Organa served as the Queen of Alderaan until the Galactic Empire utilized the Death Star to bring about the destruction of her planet during the Galactic Civil War. Post Breha's passing and Alderaan's obliteration, many surviving Alderaanians regarded Breha's adopted daughter, Princess Leia Organa, as their rightful queen. Evaan Verlaine, a former student of Breha's, was one such Alderaanian.
The Geonosians also had queens, one of which was Karina the Great, who secretly led the Stalgasin hive.
Trios, a princess from Shu-Torun, ascended to the throne of her homeworld soon after BT-1 and 0-0-0, Darth Vader's assassin droids, murdered her father and older siblings.
Certain female members of the Yalbec species were recognized as queens. During an insurrection on Yalbec Prime, Clone Force 99, a clone commando squad, encountered one of these queens. Wrecker, a soldier, severed her stinger. The stinger of a Yalbec queen was considered a delicacy by some.