Dark Web Intelligence and OSINT Techniques is a comprehensive guide that unlocks the hidden parts of the internet. In simple language, the book explains how open source intelligence (OSINT) began in wartime and evolved through the Cold War to become a powerful tool for today's investigations. It details the birth of the dark web, from Tor's creation to the many layers of the deep and dark web, and shows how history and modern technology meet. The guide explores legal and ethical issues around OSINT and dark web research, comparing laws from Europe, the US, and beyond, while also addressing privacy and human rights. Readers learn about key tools-from advanced search methods and data scraping to visualization techniques-that help turn raw data into clear insights. The book also dives into dark web marketplaces, cryptocurrencies, and the hidden logistics of illicit trade. Later, it connects social media with dark web activities, discusses global cyber threats, and highlights the role of AI, blockchain, and quantum computing in shaping future intelligence gathering. Practical examples and clear explanations make this essential book accessible for beginners and experts alike.