5 November 2010 at 23:38 GMT
Warner Bros. are giving away a Ministry of Magic visitor badge prop created for Harry Potter and the Deathly Hallows: Part 1. As well as the badge, one first place winner will receive Harry Potter Years 1-6 on Blu-ray and a PlayStation 3 (with Blu-ray player).
Second and third place winners will receive gift certificates to WBShop.com to use on Harry Potter merchandise.
To enter the competition, click here.