The NIA is a statutory body established under the NIA Act 2008 and functions under the Ministry of Home Affairs. It was established in the aftermath of the 26/11 Mumbai terror attack which exposed the limitations of existing intelligence agencies to prevent and fight such attacks. Website Content owned & provided by Ministry of Home Affairs, GoI Best viewed in Mozilla, Chrome and equivalent browsers ,Copyright© 2023 All Rights Reserved ... What is NIA Agency, Full Form , Roles & Responsibilities The National Investigation Agency ( NIA ) is the country's leading counter-terrorism authority, unwaveringly committed to defending India against terrorism and illegal activities. NIA Full Form : NIA Stands for National Investigation Agency - Learn about the NIA 's mission, jurisdiction, and investigative capabilities in dealing with serious crimes with national ramifications.