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  ===House Bolton===
  * '''"Fat" Walda Bolton''' (seasons 4–6) portrayed by Elizabeth Webster. Walda Bolton (née Frey) is a granddaughter of Lord Walder Frey. She is the new wife of Roose Bolton, the Lord of the Dreadfort. During the wedding feast of Edmure Tully and Roslin Frey, Lord Bolton recounts to Catelyn Stark and Ser Brynden "Blackfish" Tully how Lord Walder Frey proposed him to marry one of his granddaughters and offered her weight in silver as dowry. Lord Bolton then adds he chose the fattest bride available and she has made him very rich. In Season 4, she arrives at the Dreadfort with her new husband and his men (having been smuggled back into the North to avoid the Ironborn) and is greeted warmly by Ramsay Snow as "mother". She accompanies the Boltons to Winterfell, and receives Sansa Stark and Petyr Baelish along with her husband and stepson. In season 5 it is revealed that she is pregnant, which makes Ramsay feel threatened for his position as Roose's heir. In season 6, after she gives birth to a boy, she and her baby are mauled to death by Ramsay's hounds, shortly after Ramsay kills his father.
  * '''Harald Karstark''' (season 6) portrayed by Paul Rattray. The lord of Karhold and the son of Rickard Karstark, who was executed by Robb Stark. He declares for House Bolton in order to counter any Stark force that Sansa may muster after escaping Winterfell, and witnesses Ramsay kill Roose. In the subsequent battle between the Bolton forces and Jon Snow's army, Harald leads the Karstark men into battle, but he disappears in the ensuing conflict. Although his death is not shown, Jon Snow confirms it in the season 7 premiere.
  * '''Jon Umber''' (season 6) portrayed by Dean S. Jagger. "Smalljon" Umber is the son of Greatjon Umber, one of House Stark's most powerful banner men. "Smalljon" became Lord of Last Hearth, the northernmost of the castles in the North, after his father's death. Smalljon, however, chooses to side with the Boltons by handing his father's wards, Rickon Stark and Osha, to Ramsay Snow as an alliance gift, to gain Ramsay's help in countering Jon Snow and his wildling army. In the subsequent battle between Ramsay's forces and Jon Snow's army, he leads the Umber forces into battle and fights Tormund Giantsbane. Though it seems as if he will win, Smalljon is momentarily distracted by the arrival of the Knights of the Vale, long enough for Tormund to bite his throat out and stab him to death.
  * '''Myranda''' (seasons 3–6) portrayed by Charlotte Hope. Myranda is a servant of House Bolton. She is one of Ramsay Snow's bedwarmers and assists in his sadistic schemes, such as seducing Theon Greyjoy in order to give him an erection so Ramsay can castrate him, and helping Ramsay hunt a peasant girl with Ramsay's hounds solely because she was more attractive than her. She later accompanies the Boltons to Winterfell, and is present when Sansa Stark arrives with Petyr Baelish, eyeing Sansa with jealousy and anger. During Sansa's stay at Winterfell, Myranda encounters her again with Theon and torments her with stories of Ramsay's sadism. When Sansa refuses to be bullied, Myranda points an arrow to her, preparing to injure her while leaving her usable for Ramsay to father a child. However, this tips Theon into finally rebelling against the Boltons and he saves Sansa by disarming Myranda and pushing her off the castle wall to her death. Her body is found shortly afterwards by Ramsay, who pays his respects to her before having her fed to the hounds.
  * '''Locke''' (seasons 3–4) portrayed by Noah Taylor. Noah Taylor A man-at-arms sworn to House Bolton, and acts as Roose Bolton's personal bounty hunter. He captures Brienne of Tarth and Jaime Lannister who were on their way to King's Landing, Locke later cuts off Jaime's sword-hand on route to Harrenhal and tries to feed Brienne to a bear rather than hold her ransom, further demonstrating his contempt for wealth and nobility. He holds Harrenhal in Roose Bolton's name until former Master of Coin Lord Petyr Baelish is been proclaimed Lord of Harrenhal and the Riverlands. In Season 4, Locke has followed Lord Bolton in pledging loyalty to the Lannisters, and arrives at the Dreadfort with Roose and his men (having been smuggled back into the North to avoid the Ironborn). Locke warmly greets Roose's bastard Ramsay – the two are friends and share mutual interests in flaying and mutilation of their enemies. When Roose learns Bran and Rickon Stark are alive, and may pose a threat to his new title as Warden of the North, he commands Locke to go on a hunt to find the boys, in exchange for a thousand acres of land and a holdfast of his own. Locke eventually arrives at the Wall and becomes acquainted with Jon Snow, Bran and Rickon's half-brother, who he apparently plans to kill as per Ramsay's suggestion. Locke is one of the few who join Jon on his mission to kill the Night's Watch mutineers at Craster's Keep, and in the ensuing battle, he escapes the fray and locates Bran Stark held captive with Jojen Reed, Meera Reed and Hodor. Locke attempts to kidnap Bran and kill him unseen, but Bran uses his warg abilities to enter Hodor's mind, and kills Locke by snapping his neck. His body is brought back to Craster's Keep by Eddison Tollett, and burned along with the rest of the slain.