Brunor, Breunor, Branor or Brunoro are various forms of a name given to several different characters in the works of the Tristan tradition of Arthurian legend. They include the Knight of the Round Table known as Brunor/Breunor le Noir (French for "the Black") and his own father by the same name, as well as a few others.

Brunor le Noir (/ˈbruːnor lə nojr/ or /ˈbʁœ̃nɔʁ lə nwaʁ/) (alternatively Breunor, Brunoro lo Nero) is a young knight nicknamed La Cot[t]e Mal[e] Tail[l]e[e] (Modern French: La Cote Mal Taillée = "the badly cut coat") by Kay after his arrival in his murdered father's mangled armour and surcoat at King Arthur's court. He should not be confused with his father, also named Brunor the Black but better known as The Good Knight Without Fear.

Brunor's adventures first appear embedded in the Prose Tristan. They were then expanded Thomas Malory's compilation Le Morte d'Arthur and in the Italian romance La Tavola Ritonda. Brunor lacks skill in jousting, but is near-invincible on foot (in one instance in the Tavola, for example, defeating Lamorak before being defeated by Tristan). His elder brother is always Dinadan. Another brother appearing in only some versions is Daniel, who in the Tavola is slain by Lancelot, making Lancelot Brunor's sworn enemy until the two make an uneasy truce after fighting to a draw. Brunor eventually marries his lady who, like Gareth's Lynette, starts by mocking him as he goes on a long chivalric quest with her and their on-and-off companions.

Brunor has some further adventures in the Prose Tristan as a companion of Tristan, including once managing to win against Lancelot (on a technicality) while disguised as Tristan. He serves as a double of Tristan, with some of the same talents and hobbies (such as composing lais) but is unloved by Iseult after he too falls in love with her. Brunor's story contained in the episode "Chevalier a la cotte mal taille" of the 14th-century Prose Yvain tells of some of his further adventures as he single-handedly rescues Gaheriet and then participates in the rescue of Yvain.

The tale is related thematically to the "Fair Unknown" story popular in the Middle Ages, other versions of which can be found in the Arthurian stories of Gareth, Gingalain, and Percival. It most closely resembles the tale of Gareth, who is also given an insulting name by Sir Kay upon arriving at Camelot and also has to prove his worth to a damsel who constantly insults and belittles him.

The story begins as Brunor (Breunor) travels to Camelot wearing his dead father's bloodied coat, which he has vowed not to take off as long as his father is not avenged. He is met with mockery, his outfit earning him the nickname La Cote Male Taile, and he is initially rejected from Arthur's service until Sir Gawain speaks out on his behalf. After Brunor returns to the court, he endures Kay's continued attempts at humiliating him, but soon proves his worth by rescuing Queen Guinevere from an escaped lion and is knighted by Arthur.

A damsel arrives at court bearing a great black shield emblazoned with a white hand holding a sword, and tells how the knight who previously carried the shield died while on a quest. She is now searching for a knight of similar courage to continue the quest. Brunor agrees to go with her, but she taunts him regarding his clothing and appearance, earning her the nickname Maledisant ("Evil-speaking") or Mesdisant ("Ill-speaking"). After the pair leave the castle, Brunor encounters Sir Dagonet, Arthur's court jester, who has been sent by Kay to joust with the new knight. Brunor quickly defeats Dagonet, but Maledisant's taunts only increase because the court sent a fool to challenge Brunor rather than a true knight. Brunor later encounters two other knights of the Round Table, Sir Bleoberis and Sir Palomides, is challenged by them, and is unhorsed by both. They each refuse to fight him on foot and walk away, drawing more sharp criticism from Maledisant.

Brunor later travels with the young Sir Mordred to Castle Orgulous (Orguellous or Orgulous, "Proud"). The knights must fight their way into the castle. After Mordred is injured, Brunor continues alone. Inside the castle, he meets a hundred knights in a lady's chamber. Attacked by the knights, Brunor manages to get out with the aid of the black shield, mounts his horse, and escapes. Maledisant questions his story of what happened and sends a witness who returns to prove Maledisant wrong. Brunor continues to hold his peace and does not rebuke her.