Shaykh Muhammad Nasir al-Din al-Albani (1914–1999) was one of the most influential Islamic scholars of the 20th century, particularly in the field of Hadith sciences. His contributions to Islam in general and Hadith in particular have had a lasting impact on contemporary Islamic thought. As a reformist scholar, he emphasized the primacy of authentic Hadith in shaping Islamic jurisprudence, advocating for a return to the original sources of Islam— the Qur'an and Sunnah—while rejecting blind adherence to traditional madhhab-based interpretations. Al-Albani’s work in Hadith criticism is particularly noteworthy. He meticulously analyzed thousands of narrations, classifying them based on authenticity and reviving a rigorous approach to Hadith verification. His critical editions of classical Hadith collections, such as Sunan Abu Dawood and Sunan al-Tirmidhi, have become widely referenced. He also compiled works like Silsilat al-Ahadith al-Sahihah and Silsilat al-Ahadith al-Da‘ifah, which provided scholars and students with a structured assessment of Hadith reliability. Beyond Hadith studies, Al-Albani’s contributions extended to Islamic jurisprudence (Fiqh), theology (Aqeedah), and education. He was instrumental in the modern Salafi movement, advocating for the purification of Islamic beliefs from what he considered innovations (bid‘ah). Despite controversies surrounding his views, his scholarship has shaped contemporary Hadith methodology and influenced scholars, students, and institutions worldwide. This paper explores his contributions, methodology, and the debates surrounding his legacy, highlighting his role in revitalizing Hadith sciences and Islamic thought in the modern era.