The Atlas of Eocene Planktonic Foraminifera contains a fundamental re-assessment of the taxonomy, paleoecology, evolutionary relationships and stratigraphic distributions of planktonic foraminifera from the Eocene Epoch based on new scanning electron micrographs of most of the type specimens and extensive illustration of well-preserved material from around the world. In total 166 species from 36 genera are described, of which ten species and three genera are new. Analysis of wall structures provides the basis for the higher taxonomy, dividing the species into microperforate, spinose and non-spinose groups. Several new subtypes of wall microstructure are described for the first time. Eocene normal perforate planktonic foraminifera are divided into the Families Globigerinidae, Hantkeninidae, Truncorotaloididae, Hedbergellidae and on a new family which contains the genus Turborotalia. Eocene microperforate species, which are less well known, are divided in the Families Candeinidae, Cassigerinellidae, Chiloguembelinidae, Guembelinidae and Heterhelicidae. Detailed range charts and phylogenetic charts of all the species are presented relative to revised biostratigraphic zonation schemes for the tropics and high southern latitudes. The available stable isotope data for each species is synthesized, and some new data are presented. This atlas also identifies areas for future research on the study of Eocene planktonic foraminifera.