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Madam Bellatrix Lestrange (née Black) (1951 – 2 May, 1998) was a pure-blood witch, the eldest daughter of Cygnus Black III and Druella Black (née Rosier) and elder sister of Andromeda Tonks and Narcissa Malfoy. She was a member of the House of Black, an old wizarding family and one of the Sacred Twenty-Eight. Bellatrix started her education at Hogwarts School of Witchcraft and Wizardry in 1962 and was Sorted into Slytherin House.
After graduating from Hogwarts, she became a Death Eater. She was fanatically loyal to Lord Voldemort and was among the most dangerous and sadistic of Voldemort's followers. While Bellatrix and Narcissa married pure-blood wizards, Andromeda married Ted Tonks, a Muggle-born wizard and was disowned by the family. Andromeda was burned off the Black Family Tree, just like Sirius Black, and they were forbidden to talk about her. At the end of the First Wizarding War Bellatrix, Rodolphus Lestrange (husband), Rabastan Lestrange (brother-in-law), and Barty Crouch Jr took part in the torture of the Aurors Frank and Alice Longbottom, parents of Neville Longbottom, to the point of driving them insane, while searching for information on Lord Voldemort after his first downfall. They were caught and sentenced to life imprisonment in Azkaban for torturing the two Aurors.
Bellatrix escaped from Azkaban in the 1996 mass break-out, along with nine other Death Eaters. She participated in several battles of the Second Wizarding War, making it a particular goal to murder any relatives who were members of the Order of the Phoenix, including her cousin Sirius Black and niece Nymphadora Tonks. Bellatrix also murdered the Malfoy family's former house-elf, Dobby, who had become a firm ally of Harry Potter, with her knife. During the final battle, apart from Voldemort, she was the last Death Eater standing, but was eventually killed in a duel by Molly Weasley after her attempted murder of Molly Weasley's daughter, Ginevra Weasley.
Unknown to the world, however, before her death, Bellatrix gave birth to a daughter named Delphini, whom she conceived with her beloved master, Lord Voldemort. Delphini was conceived sometime after the Battle of the Department of Mysteries in 1996 and before Bellatrix's death at the Battle of Hogwarts.
- She was portrayed by Helena Bonham Carter in four of the eight films (starting from the fifth film,The Order of the Phoenix, to the final film, The Deathly Hallows-Part 2). She was voiced with the use of Archive Audio.
- A mentioned character in Fantastic Beasts and Where to Find Them, Leta Lestrange, has the same last name as her. It is unknown whether the two are related or not.