"Mockingbird" is the seventh episode of the fourth season of HBO's fantasy television series Game of Thrones, and the 37th overall. The episode was written by series co-creators David Benioff and D. B. Weiss, and directed by Alik Sakharov. It aired on May 18, 2014.

The title refers to the symbol of House Baelish, Littlefinger's house.

In the dungeons, Jaime Lannister (Nikolaj Coster-Waldau) berates Tyrion Lannister (Peter Dinklage) for his outburst against the people of King's Landing and ruining the deal Jaime had made with Tywin Lannister. Tyrion angrily counters they both know that deal was Tywin's plan all along, and it felt good to take that from him. Tyrion asks Jaime to be his champion, but Jaime declines due to his poor performance with his left hand. Tyrion then asks Jaime to locate Bronn (Jerome Flynn), and asks who their sister Cersei (Lena Headey) has named as champion. Her champion turns out to be Ser Gregor "The Mountain" Clegane (Hafþór Júlíus Björnsson), whom Cersei greets while he executes several prisoners. Days later, Bronn visits Tyrion and informs him that Cersei offered to wed him to Lollys Stokeworth, a highborn lady with good prospects of a rich inheritance, and admits his own fear of The Mountain's fighting prowess. He states that he will not face the Mountain on Tyrion's behalf. Though Tyrion believes himself dead already, they part as friends.

At night, Oberyn Martell (Pedro Pascal) visits Tyrion and recounts that he visited Tyrion in his infancy and has long been aware of his sister's antagonism towards him. A broken Tyrion admits that Cersei "always gets what she wants", to which Oberyn counters that she cannot give him what he wants; vengeance for the murder of his sister, Elia, and her children. He then announces he intends to commence his revenge by championing Tyrion's cause in the ring, thus giving him the perfect chance to confront and kill Ser Gregor.

Jon Snow (Kit Harington) and his remaining men return to Castle Black. At a meeting, he implores Ser Alliser Thorne (Owen Teale) to block the passage through the Wall to prevent Mance Rayder's army from coming through, but his request is denied.

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