Data have been compiled on the cross sections for the collisions of electrons and photons with atomic oxygen (O). The processes considered are total scattering, elastic scattering, momentum transfer, excitations of electronic states (including fine structure levels of the ground state), ionization, and electron attachment. The cross‐section data are presented graphically. Energy levels, transition probabilities and some other properties of atomic oxygen are summarized to aid understanding of the collision processes. The literature was surveyed through December 1988, but more recent data, if they are available to the authors, are included also.