We discuss the importance of plasma physics in various areas of cosmology and astrophysics: (1) the primordial plasma spectrum, (2) the cosmic microwave background, (3) the large-scale structure of the universe, (4) reionization and the metalicity of the primordial universe, (5) the first objects, (6) the primordial magnetic field, (7) clusters of galaxies, (8) galaxy formation, (9) star formation, (10) nuclear reactions, (11) accretion onto black holes, (12) cosmic rays, (13) relativistic jets and (14) gamma ray bursters.