Bangladesh Black Hat Hackers aka BD Black Hats (Bengali: বাংলাদেশ ব্ল্যাক হ্যাট হ্যাকার্স) is a hacker group based in Bangladesh. It claimed in 2012 to have hacked Indian websites in retaliation for border killings by the Indian Border Security Force and the construction of the Tipaimukh Dam.^[1][2][3][4] Although Bangladesh Black Hat Hackers declared this cyber war, later two other Bangladesh based hacker groups Bangladesh Cyber Army and 3xp1r3 Cyber Army also joined them.^[5] The incident is described as a cyber war without the presense of any governmental personnel in it.^[1][6]। The threat of the attack was given on 9 February, 2012 and till 12 February 10,000 websites were claimed to have been hacked.^[6][7] The number rose to 20,000 later.^[1][8] There were revenge attacks from the Indian side as well with groups such as Indian Cyber Army attacking Bangladeshi sites.^[8]

Around March 2015, the group also took responsibility for hacking Shashi Tharoor's website, owing to negative comments against Bangladesh's cricket win against England.^[9][10]