H Handbook of Tawhidi Methodology is a collection of essays, some from published and other ones freshly contributed. These materials together expound the methodological conception and quantitative application of the monotheistic law of the Quran and the Sunnah, Tawhid. A wide field of intellection in this regard is covered in the field of science and the socio-scientific use of the epistemological origins of the Quran and the Sunnah. The Handbook is firstly meant to be a teaching and research reference for postgraduate students. It is also a material for research undertaking for all classes of researches who are in the quest for new epistimological foundations of socio-scientific thought on unity of knowledge and the world system.