Part of 1 of 2 Species of eucalypts are commonly cultivated for solid wood and pulp products. The expansion of commercially managed eucalypt plantations has chiefly been driven by their rapid growth and suitability for propagation across a very wide variety of sites and climatic conditions. Infection of foliar fungal pathogens of eucalypts is resulting in increasingly negative impacts on commercial forest industries globally. To assist in evaluating this threat, the present study provides a global perspective on foliar pathogens of eucalypts. We treat 110 different genera including species associated with foliar disease symptoms of these hosts. The vast majority of these fungi have been grown in axenic culture, and subjected to DNA sequence analysis, resolving their phylogeny. During the course of this study several new genera and species were encountered, and these are described. New genera include: Lembosiniella (L. eucalyptorum on E. dunnii, Australia), Neosonderhenia (N. eucalypti on E. costata, Australia), Neothyriopsis (N. sphaerospora on E. camaldulensis, South Africa), Neotrichosphaeria (N. eucalypticola on E. deglupta, Australia), Nothotrimmatostroma (N. bifarium on E. dalrympleana, Australia), Nowamyces (incl. Nowamycetaceae fam. nov., N. globulus on E. globulus, Australia), and Walkaminomyces (W. medusae on E. alba, Australia). New species include (all from Australia): Disculoides fraxinoides on E. fraxinoides, Elsinoe piperitae on E. piperita, Fusculina regnans on E. regnans, Marthamyces johnstonii on E. dunnii, Neofusicoccum corticosae on E. corticosa, Neotrimmatostroma dalrympleanae on E. dalrympleana, Nowamyces piperitae on E. piperita, Phaeothyriolum dunnii on E. dunnii, Pseudophloeospora eucalyptigena on E. obliqua, Pseudophloeospora jollyi on Eucalyptus sp., Quambalaria tasmaniae on Eucalyptus sp., Q. rugosae on E. rugosa, Sonderhenia radiata on E. radiata, Teratosphaeria pseudonubilosa on E. globulus and Thyrinula dunnii on E. dunnii. A new name is also proposed for Heteroconium eucalypti as Thyrinula uruguayensis on E. dunnii, Uruguay. Although many of these genera and species are commonly associated with disease problems, several appear to be opportunists developing on stressed or dying tissues. For the majority of these fungi, pathogenicity remains to be determined. This represents an important goal for forest pathologists and biologists in the future. Consequently, this study will promote renewed interest in foliar pathogens of eucalypts, leading to investigations that will provide an improved understanding of the biology of these fungi. Key words: Corymbia, Eucalyptus, Foliar pathogen, New taxa, Taxonomy. Taxonomic novelties: new family: Nowamycetaceae Crous; New genera: Lembosiniella Crous, Neosonderhenia Crous, Neothyriopsis Crous, Neotrichosphaeria Crous & Carnegie, Nothotrimmatostroma Crous, Nowamyces Crous, Walkaminomyces Crous & Carnegie; New species: Disculoides fraxinoides Crous, Elsinoe piperitae Crous, Fusculina regnans Crous, Lembosiniella eucalyptorum Crous & Carnegie, Marthamyces johnstonii Crous & Carnegie, Neofusicoccum corticosae Crous & Summerell, Neosonderhenia eucalypti Crous, Neotrimmatostroma dalrympleanae Crous, Nowamyces globulus Crous, Nowamyces piperitae Crous, Phaeothyriolum dunnii Crous & Carnegie, Pseudophloeospora eucalyptigena Crous, Pseudophloeospora jollyi Crous, Quambalaria tasmaniae Crous, Quambalaria rugosae Crous, Sonderhenia radiata Crous, Teratosphaeria pseudonubilosa G. Perez & Carnegie, Thyrinula dunnii Crous & Carnegie; New combinations: Allelochaeta brevilata (H.J. Swart & D.A. Griffiths) Crous, Blastacervulus robbenensis (Crous et al.) Crous, Lembosiniella eucalypti (Sivan. & R.G. Shivas) Crous, Neofusicoccum versiforme (Z.Q. Yuan et al.) Crous, Neosonderhenia foliorum (Cooke) Crous, Neothyriopsis sphaerospora (Marasas) Crous, Neotrichosphaeria eucalypticola (Sivan. & R.G. Shivas) Crous & Carnegie, Nothotrimmatostroma bifarium (Gadgil & M.A. Dick) Crous, Nothotrimmatostroma eucalyptorum (Crous & Carnegie) Crous, Phacidium innumerum (Massee) Crous, Phaeothyriolum amygdalinum (Cooke & Massee) Crous & Carnegie, Phaeothyriolum corymbiae (Crous) Crous, Phaeothyriolum eucalyptorum (Crous & W.B. Kendr.) Crous, Pseudocercospora tumulosa (Carnegie & Beilharz) Carnegie & Crous, Teratosphaeria delegatensis (R.F. Park & Keane) Crous, Thyrinula parasitica (Crous) Crous, Walkaminomyces medusae (Carnegie & G.S. Pegg) Crous & Carnegie; New name: Thyrinula uruguayensis Crous for Heteroconium eucalypti Crous & M.J. Wingf.; Epitypes: Arnaudiella eucalyptorum Crous & W.B. Kendr., Lembosiopsis eucalyptina Petr. & Syd., Leptostromella eucalypti Cooke & Massee, Microthyrium amygdalinum Cooke & Massee, Mycosphaerella marksii Carnegie & Keane, Sphaerella cryptica Cooke, Stigmina robbenensis Crous et al., Thyriopsis sphaerospora Marasas, Trichosphaeria eucalypticola Sivan. & R.G. Shivas, Trimmatostroma bifarium Gadgil & M.A. Dick.