The current classification of the Felidae was reviewed by a panel of 22 experts divided into core, expert and review groups, which make up the Cat Classification Task Force CCTF of the IUCN Cat Specialist Group. The principal aim of the CCTF was to produce a consensus on a revised classification of the Felidae for use by the IUCN. Based on current published research, the CCTF has fully revised the classification of the Felidae at the level of genus, species and subspecies. A novel traffic-light system was developed to indicate certainty of each taxon based on morphological, molecular, biogeographical and other evidence. A concordance of good evidence in the three principal categories was required to strongly support the acceptance of a taxon. Where disagreements exist among members of the CCTF, these have been highlighted in the accounts for each species. Only further research will be able to answer the potential conflicts in existing data. A total of 14 genera, 41 species and 77 subspecies is recognised by most members of the CCTF, which is a considerable change from the classification proposed by Wozencraft (2005), the last major revision of the Felidae. Future areas of taxonomic research have been highlighted in order to answer current areas of uncertainty. This classification of the Felidae will be reviewed every five years unless a major new piece of research requires a more rapid revision for the conservation benefit of felid species at risk of extinction.