Although terrorism, broadly understood as violent extremism or militancy, has long historical roots, in Bangladesh, it surfaced in the 1970s through leftist militants. Later, it shifted to Islamist extremism in the 1980s and flourished throughout the 1990s, and reached its peak in the early 2000s. The menace of terrorism, particularly in the form of Islamic militancy, has widely been felt in Bangladesh’s society and polity since 1999. Since then, several militant groups have gained ground and started to challenge the government over the issues of the political process and social systems. The central goal of the operations of the militant groups is to establish an Islamic regime in the country. The Fifth Amendment of the Bangladesh Constitution, under the Zia regime in the late 1970s, and the eighth amendments of the Constitution, under Ershad regime in the early 1980s, have placed Islam at the state level to recognise its importance in the country. This encouraged the religious and right-wing forces to grab the power of the state. On the other hand, the secular Constitution of Bangabandhu Sheikh Mujibur Rahman in 1972 separated religion from the state and prohibited religion-based political parties. This was reversed by the military dictators in the name of multiparty democracy. Since then, Bangladesh witnessed the emergence of right-wing Islamist forces. Understandably, the contemporary variant of extremism experienced by Bangladesh is the religious one and is the product of the Afghan War (1979-1992). The connection with the Afghan war was established in 1984 when estimated 3,000 volunteers travelled to Afghanistan. On April 30, 1992, a week after the mujahideen emerged victorious, the Bangladeshi participants of the war expressed their delight at a press conference in Dhaka where the speakers identified themselves as members of HuJI-Bangladesh (HuJI-B). In the second half of the 1990s, several religious extremist groups emerged in Bangladesh with different objectives. The first-ever terrorist incident inspired by this religious extremism experienced by Bangladesh perpetrated by one of these groups, HUJI-B is the bombing at a venue of the cultural program organised by Udichi, in 1999 killing 10 people and injuring around 150. The rejuvenation of the Islamic political parties can be explained in terms of the enhanced role of terrorist groups in Bangladesh politics. During the same period, other extremist groups, the Jagrata Muslim Janata, Bangladesh (JMJB) and the Jamaat-al Mujahedin Bangladesh (JMB), also emerged and started functioning in Bangladesh. Their purported motivation was to wage “Islamic Movements” in Bangladesh and ultimately establish an “Islamic state” based on the Shariah law. From March 6, 1999, to November 29, 2005, at least 23 significantly successful bombings were launched by different militant-terrorist groups, which left some 142 people dead along with thousands injured. Militant attacks escalate conflicts between the government and armed groups. Militancy reached its peak with the most heinous crime of grenade attacks on former Prime Minister Sheikh Hasina during a meeting on August 21, 2004, followed by the biggest terrorist incident on August 17, 2005, when activists of the JMJB detonated 459 bombs in 63 out of the 64 districts of the country. To mention some violent attacks: the bomb explosion at Ramna on the eve of Bengali New Year in April 2001; January 27, 2005, attack in Habiganj killing the then Finance Minister; courtroom and court premises bomb blasts in October and November of 2005 killing two district judges in Jhalokathi district. Most of these attacks were carried out by JMB. BNP-led government (2001-2006) initially failed to take action against it due to limited law enforcement capacity but also sympathy for these groups within Jamaat-e-Islami (JeI), Bangladesh’s largest Islamist party and a member of the BNP’s governing alliance. However, Bangladesh successfully tackled that wave of terrorism with top JMB leaders facing justice, thanks to the Rapid Action Battalion (RAB). Following a hiatus of six to seven years, the resurgence of terrorism is evident in Bangladesh starting with the killing of Blogger Rajib Haider in February 2013, – an activist of the Gono Jagoron Mancho (mass upsurge stage) that emerged to protest the International Crime Tribunal verdict of Jamaat-e-Islami Assistant Secretary General Abdul Kader Molla. From 2013, about 70 terror attacks have been carried out, and about 52 in the next 18 months on diversified targets, including bloggers, preachers, academic, social, and religious minorities, and foreigners. In July 2016, the horrendous Holey Artisan Bakery attacks by the terrorists culminated violent extremism in Bangladesh. It seems the incidents of extremism had been accelerated in the form of political violence with the linkages of religious fundamentalist forces and right-wing political parties. Major political parties that came to power in the mid-1970s formed alliances with Islamic groups. With direct and indirect linkages of Islamic political parties, radical Islamism has taken a durable shape in Bangladesh. Leading factors of rising extremism in Bangladesh: Understanding the root causes of extremism is critically important to understand its uniqueness in Bangladesh. There are different sources of extremism in Bangladesh leading to the acts of violence and terrorism: (i) proliferation of Islam-based institutions and organisations in the country; (ii) rise of power-seeking Islamist extremism, (iii) rigid religious beliefs, grievances, and subcultures of conspiracy; (iv) misinterpretation of religious ideologies; (v) political instability that providing opportunities for extremists; (vi) radicalisation; and (viii) regional and global connections. Many analysts claim that a link exists between Islam-based political groups and extremists in Bangladesh. The proliferation of these institutions and organisations is an overt manifestation of extremism. The rejuvenation of the Islamic political parties in Bangladesh can also be explained in terms of the enhanced role of terrorist groups in Bangladesh politics. Many radical clerics also call against the secular segment of society. Bangladesh’s Effort to Curb Terrorism: The leadership of Sheikh Hasina, who came to power in 2009 with a strong determination to curb extremist forces from Bangladesh and the re-emergence of non-communal and secular forces, has reversed the political environment created by the erstwhile political regimes. The Hasina government introduced a zero-tolerance policy and amended Anti-Terrorism Act to combat politically and religiously motivated extremism in Bangladesh. The government has taken a two-pronged strategy to deal with radical, fundamentalist, and communal forces. The counter-terrorism and anti-terrorism capacity of the state have been bolstered and cultural, social and community engagement have been expanded. And, the role of civil society actors has been emphasised at the government and non-governmental levels. Society has quickly witnessed a positive outcome of the zero-tolerance policy. However, the threat of terrorism looms large in society as terrorism only changes form and method. The emergence of a nascent organisation, Jamatul Sharqiya, and Al-Qaeda Indian Subcontinent (AQIS) is now posing threat to the country and the region. The right-wing and Islamist political forces that have always maintained connections with violent extremist forces are exerting their influence in society. This is an ominous sign in this part of the world. Bangladesh should not become a state, run by right-wing forces having linkages with militant and extremist forces. This reminds the era of the 1990s and 2000s when they created a reign of terror. This was the time when many analysts predicted Bangladesh to become like a “Taliban-ruled Afghanistan.” Many terrorist and radical groups even chanted slogans that Bangla (Bangladesh) would become Afghanistan. Therefore, the nexus between right-wing and terrorism must be seen from a proper perspective for peace, stability, and prosperity in Bangladesh and the greater sub-region of South Asia. The writer is a retired government official from Bangladesh.