Neutrinos are fundamental particles that were thought to be simple massless particles that only experienced the weak interaction. Recent measurements have shown that the neutrino is much more complex and these particles can potentially provide a window into new areas of physics. Observations of the structure of the universe require the existence of a new form of a new form of gravitationally interacting matter known as dark matter. Experiments to detect neutrinos and dark matter both have distinct features to achieve the extremely low backgrounds that are required to measure these particles. This course will discuss the field of neutrinos physics and dark matter and these low background techniques.