The Directorate General of National Security Intelligence (Bengali: জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা), commonly known as the NSI, is the principal civilian intelligence agency of the People's Republic of Bangladesh (গণপ্রজাতন্ত্রী বাংলাদেশ). The NSI's headquarters is in 1 Segunbagicha, Dhaka, Bangladesh. The NSI is the leading body of the Government of Bangladesh in the field of internal security, counter terrorism, counter intelligence and foreign intelligence.