Ancient Indian Scientific Thought and Modern Theories makes one revisit the development of Indian science and technology in varied fields since the Vedic period, and suggests that we have a living tradition which is vivid and dynamic, inheriting at the same time claiming freedom from the past. It is the proceedings of a three-day seminar held during 25-27 March 2017 in Kolkata, organized by the Sanskrit Sahitya Parishad, Kolkata, and sponsored by NMM. This volume bears testimony to the fact that Indian sages, philosophers and scholars had a grip on all the topics that the modern-day scientists deal with, including complicated surgery and quantum mechanics. Our Vedas, Upanisads and other literary works were the storehouse of scientific wisdom, though the prevailing socio-religious conditions impeded its widespread dissemination. This volume is expected to invoke keen interest among all who wants to know about a scientific past that Indians inherit, be a scientist or a layman.