- Cast: Daniel Radcliffe, Rupert Grint, Emma Watson, Helena Bonham Carter, David Bradley, Robbie Coltrane, Warwick Davis, Tom Felton, Michael Gambon, Alan Rickman, Maggie Smith, Natalia Tena, Julie Walters and David Thewlis, Evanna Lynch, Matthew Lewis, Bonnie Wright, Jim Broadbent, Helen McCrory, Jessie Cave, Hero Fiennes Tiffin, Frank Dillane
- Director: David Yates
- Writer: Steven Kloves
- Producers: David Barron, David Heyman
- Executive Producer: Lionel Wigram
- Art Directions: Alastair Bullock, Hattie Storey, Sloane U'Ren
- Casting: Fiona Weir
- Costume Design: Jany Temime
- D.O.P.: Bruno Delbonnel
- Editor: Mark Day
- Music: Nicholas Hooper
- Production Design: Stuart Craig
Voldemort is tightening his grip on both the Muggle and wizarding worlds and Hogwarts is no longer the safe haven it once was. Harry suspects that dangers may even lie within the castle, but Dumbledore is more intent upon preparing him for the final battle that he knows is fast approaching. Together they work to find the key to unlock Voldemort?s defenses and, to this end, Dumbledore recruits his old friend and colleague, the well-connected and unsuspecting bon vivant Professor Horace Slughorn, whom he believes holds crucial information.
Meanwhile, the students are under attack from a very different adversary as teenage hormones rage across the ramparts. Harry finds himself more and more drawn to Ginny, but so is Dean Thomas. And Lavender Brown has decided that Ron is the one for her, only she hadn?t counted on Romilda Vane?s chocolates! And then there?s Hermione, simpering with jealously but determined not to show her feelings. As romance blossoms, one student remains aloof. He is determined to make his mark, albeit a dark one. Love is in the air, but tragedy lies ahead and Hogwarts may never be the same again."
- Aspect Ratio: 2.35:1
- Filming Locations: Bjorli, Norway; Ireland; London, UK; Scotland;
- Production Budget: $200 million
- Production Companies: Warner Bros. Pictures, Heyday Films
- Production Schedule: 24 September 2007 - 17 May 2008
Director Guillermo del Toro turned down the chance to direct this film so he could work on Hellboy II: The Golden Army (2008).
Anand Tucker and Michael Hoffman were both rumored as possible directors for this film.
Helen McCrory had been cast to play Bellatrix Lestrange in Harry Potter and the Order of the Phoenix (2007), but had to back out because she was pregnant. She will play Bellatrix's sister, Narcissa Malfoy in this film.
Jessie Cave beat over 7000 girls to win the role of Lavender Brown, Ron's "love-interest" from the book.
Hero Fiennes-Tiffin has been cast as Tom Riddle, Age 11, while his uncle, Ralph Fiennes plays Lord Voldemort (formerly Tom Riddle). His parents are Martha Fiennes (Ralph's sister) and George Tiffin.
Quidditch at Hogwarts makes a grand (and much publicized) return, after being completely absent since the fourth installment.
Robert Knox, who plays Marcus Belby, was tragically stabbed to death on May 24, 2008, just days after filming wrapped.
Director David Yates says that he hired Hero Fiennes-Tiffin to play the young Voldemort/Tom Riddle because of his resemblance to his uncle Ralph Fiennes (who plays Voldemort/Tom Riddle as an adult) but not specifically because he was the actor's nephew. He liked the dark haunted quality about the young actor.
Christian Coulson, who played the 16-year-old Tom Marvolo Riddle in Harry Potter and the Chamber of Secrets (2002), was long rumored to be reprising his role for this film, but, at the age of 30, it was decided that he was too old for the part.
Naomi Watts was the first choice to play the part of Narcissa Malfoy but dropped out due to scheduling conflicts.
Thomas James Longley auditioned for the role of 'Tom Riddle', but lost out to Frank Dillane.
Alarn Horn, President and Chief Operating Officer of Warner Bros. stated that due to "repercussions of the writers' strike" they were offered "new windows of opportunity that we (Warner Bros.) wanted to take advantage of." The film’s release date was then moved from November 21, 2008 to July of 2009.
The changing of the release date from November 21, 2008 to July 17, 2009 actually helped increase the number of IMAX theaters that Half-Blood Prince will be available in. The November release had only 40 IMAX theaters showing the film; that number has increase by 60 theaters for a total of 100 IMAX theaters releasing the film in July.
In the movie we see a collapsing of the Millennium Bridge. This differs from the source book since the Millennium Bridge was built in 2000, and the plot of Half-Blood Prince takes place in 1996, according to J.K. Rowling. However, in the movies there are no references to which year the setting of the story takes place.
Two new scenes were added that do not appear in the book: The collapsing Millenium bridge (at the beginning of the film, and which appears in the Third Trailer) and the Death Eater attack at the Burrow (seen in the second trailer). An attack on a Muggle bridge is actually mentioned in the original opening of the book by Cornelius Fudge, but not shown.