Atmospheric neutrinos are produced when cosmic rays crash into the atmosphere. They have played a key role in the discovery of neutrino oscillation and continue to serve as an important natural neutrino source, covering a wide range of energy and oscillation baseline. In this seminar, I’ll briefly introduce the production mechanism and the detection, then highlight on the oscillation analyses with atmospheric neutrinos in large neutrino detectors such as Super-Kamiokande, IceCube, and DUNE. A brief review on other atmospheric neutrino related physics will also be included.