Lavender Brown is a Gryffindor student. She is a close friend of housemate Parvati Patil; they seem to enjoy the same classes, especially Divination, and share many common interests. The two also seem to have a reasonably close relationship with Professor Trelawney, comforting and supporting her in her various crises. Lavender is one of the few students who help round up the Blast-Ended Skrewts after a disastrous Care of Magical Creatures class, and she attends the Yule Ball with Seamus Finnigan in their fourth year. She initially believes the Ministry's smear campaign against Harry, but is among the original members of Dumbledore's Army.
In Half-Blood Prince, Lavender becomes Ron's first girlfriend for several months, an arrangement Ron is initially enthusiastic about. He appears to be partly going out with her to make Hermione jealous and to prove that he can "snog" people whenever he wants. It becomes increasingly evident that Ron is not particularly enamoured of Lavender and actually finds her irritating. Lavender becomes jealous of Ron's friendship with Hermione, and finally splits up with him when she sees them leaving Harry's dormitory together, as she is under the impression that they had been alone together, not realising Harry was there under his invisibility cloak that was given to him by his father. In Deathly Hallows, Lavender is badly injured in the Battle of Hogwarts, after she falls from a balcony and is attacked by Fenrir Greyback, before being rescued by Hermione.
Jennifer Smith portrayed Lavender in a brief, non-speaking role in Prisoner of Azkaban. Jessie Cave played the character in a larger role in Half-Blood Prince, and returned for the second part Deathly Hallows.