This research explores the Islamic perspective on radicalism and terrorism, emphasizing their contradiction with true Islamic values. Islam, as a peaceful religion, teaches that violence should only be used in limited circumstances, such as self-defense or protecting human rights. Acts of violence, especially terrorism, are considered prohibited in Islamic law. Radicalism and terrorism are complex phenomena often associated with religion, particularly against Islam. Although not all Muslims engage in radical or terrorist activities, these issues have become global concerns due to widespread terrorist attacks. The research uses a qualitative descriptive method with Maudhu'i interpretation. Data analysis involves inventory, classification, and interpretation, while data validity is checked through library research. The study highlights the historical context of radicalism and terrorism, noting that they often emerge from religious doctrines and have been linked to conflicts in the Middle East. Radicalism is defined as an ideology demanding rapid change and reform, often through violence, while terrorism is the use of violence and intimidation for political purposes. The Qur'an prohibits excessive religious practices and idolatry, as seen in Surah Al-Nisa verse 171 and Surah Al-Maidah verse 77. These verses emphasize the importance of not exceeding religious limits and following the true teachings of Islam. The interpretations of these verses by scholars like Wahbah Az-Zuhaili and Ibn Kathir highlight the prohibition of exaggeration in religious beliefs and the importance of adhering to the true message of Islam. The research concludes that radicalism and terrorism are contrary to Islamic values, and the Qur'an does not justify such actions. Instead, it promotes peace, tolerance, and moderation. Islam is a religion of peace and security, teaching that violence should be avoided unless necessary. The study also notes that Islamic history includes wars that must be understood in their context, including the interpretation of relevant Qur'anic and Hadith verses. Overall, the research underscores the importance of adhering to Islamic teachings to prevent radicalism and terrorism.This research explores the Islamic perspective on radicalism and terrorism, emphasizing their contradiction with true Islamic values. Islam, as a peaceful religion, teaches that violence should only be used in limited circumstances, such as self-defense or protecting human rights. Acts of violence, especially terrorism, are considered prohibited in Islamic law. Radicalism and terrorism are complex phenomena often associated with religion, particularly against Islam. Although not all Muslims engage in radical or terrorist activities, these issues have become global concerns due to widespread terrorist attacks. The research uses a qualitative descriptive method with Maudhu'i interpretation. Data analysis involves inventory, classification, and interpretation, while data validity is checked through library research. The study highlights the historical context of radicalism and terrorism, noting that they often emerge from religious doctrines and have been linked to conflicts in the Middle East. Radicalism is defined as an ideology demanding rapid change and reform, often through violence, while terrorism is the use of violence and intimidation for political purposes. The Qur'an prohibits excessive religious practices and idolatry, as seen in Surah Al-Nisa verse 171 and Surah Al-Maidah verse 77. These verses emphasize the importance of not exceeding religious limits and following the true teachings of Islam. The interpretations of these verses by scholars like Wahbah Az-Zuhaili and Ibn Kathir highlight the prohibition of exaggeration in religious beliefs and the importance of adhering to the true message of Islam. The research concludes that radicalism and terrorism are contrary to Islamic values, and the Qur'an does not justify such actions. Instead, it promotes peace, tolerance, and moderation. Islam is a religion of peace and security, teaching that violence should be avoided unless necessary. The study also notes that Islamic history includes wars that must be understood in their context, including the interpretation of relevant Qur'anic and Hadith verses. Overall, the research underscores the importance of adhering to Islamic teachings to prevent radicalism and terrorism.