• Eucalyptus L'Héritier de Brutelle, 1789
• Eucalyptus abbreviata Blakely & Jacobs accepted as Corymbia abbreviata (Blakely & Jacobs) K.D. Hill & L.A.S. Johnson
• Eucalyptus abdita Brooker & Hopper
• Eucalyptus abergiana F. Muell. accepted as Corymbia abergiana (F. Muell.) K.D. Hill & L.A.S. Johnson
• Eucalyptus absita Grayling & Brooker
• Eucalyptus acaciiformis Deane & Maiden
• Eucalyptus acacioides A. Cunn. ex Maiden accepted as Eucalyptus viridis R. Baker
• Eucalyptus accedens W.V. Fitzg.
• Eucalyptus acervula auct. non Sieber ex DC. accepted as Eucalyptus ovata Labill.
• Eucalyptus acervula Sieber ex DC. accepted as Eucalyptus eugenioides Sieber ex Sprengel
• Eucalyptus acies Brooker
• Eucalyptus acmenoides Schauer
• Eucalyptus acroleuca L.A.S. Johnson & K.D. Hill
• Eucalyptus acuminata Hook. accepted as Eucalyptus camaldulensis Dehnh.
• Eucalyptus acutangula Turcz. accepted as Eucalyptus tetraptera Turcz.
• Eucalyptus aenea K.D. Hill
• Eucalyptus aequioperta Brooker & Hopper
• Eucalyptus agglomerata Maiden
• Eucalyptus aggregata Deane & Maiden
• Eucalyptus agnata Domin accepted as Eucalyptus occidentalis Endl.
• Eucalyptus alaticaulis Watson & Ladiges
• Eucalyptus alba Reinw. ex Bl.
• Eucalyptus albens Benth.
• Eucalyptus albida Maiden & Blakely
• Eucalyptus albopurpurea (Boomsma) D. Nicolle
• Eucalyptus alligatrix L.A.S. Johnson & K.D. Hill
• Eucalyptus alorensis K.D. Hill & L.A.S. Johnson
• Eucalyptus alpina R. Br. ex Maiden accepted as Eucalyptus coccifera Hook. f.
• Eucalyptus altior (Deane & Maiden) Maiden accepted as Eucalyptus oreades R. Baker
• Eucalyptus ammophila Brooker & A. Slee
• Eucalyptus amplifolia Naudin
• Eucalyptus amygdalina auct. non labill. accepted as Eucalyptus nitida Hook. f.
• Eucalyptus amygdalina Labill.
• Eucalyptus amygdalina Schauer accepted as Eucalyptus leptophylla F. Muell. ex Miq.
• Eucalyptus anceps (R. Br. ex Maiden) Blakely accepted as Eucalyptus rugosa R. Br. ex Blakely
• Eucalyptus anceps auct. pl. quoad Type accepted as Eucalyptus phenax Brooker & Slee
• Eucalyptus anceps R. Br. ex Maiden accepted as Eucalyptus rugosa R. Br. ex Blakely
• Eucalyptus ancophila L.A.S. Johnson & K.D. Hill
• Eucalyptus andreana Naudin accepted as Eucalyptus elata Dehnh.
• Eucalyptus andrewsii Maiden
• Eucalyptus androsmaefolia Hoffsgg. accepted as Eucalyptus ovata Labill.
• Eucalyptus angophoroides R. Baker
• Eucalyptus angulosa Naudin ex Maiden accepted as Eucalyptus tereticornis Sm.
• Eucalyptus angulosa Schauer
• Eucalyptus angusta Maiden accepted as Eucalyptus rigidula Maiden
• Eucalyptus angustata Brooker accepted as Angophora bakeri C. Hall
• Eucalyptus angustifolia Desf. accepted as Eucalyptus viminalis Labill.
• Eucalyptus angustifolia R. Br. ex Maiden accepted as Eucalyptus amygdalina Labill.
• Eucalyptus angustifolia Turcz. accepted as Eucalyptus leptopoda Benth.
• Eucalyptus angustifolia Woolls accepted as Eucalyptus crebra F. Muell.
• Eucalyptus angustissima F. Muell.
• Eucalyptus annulata Benth.
• Eucalyptus annuliformis Grayling & Brooker
• Eucalyptus aparrerinja (K.D. Hill & L.A.S. Johnson) Brooker accepted as Corymbia aparrerinja K.D. Hill & L.A.S. Johnson
• Eucalyptus apiculata R. Baker & H.G. Smith
• Eucalyptus apocynifolia (Salisb.) Brooker accepted as Angophora costata (Gaertn.) Britten
• Eucalyptus apodophylla Blakely & Jacobs
• Eucalyptus apothalassica L.A.S. Johnson & K.D. Hill
• Eucalyptus approximans Maiden
• Eucalyptus aquatica (Blakely) L.A.S. Johnson & K.D. Hill
• Eucalyptus aquilina Brooker
• Eucalyptus arachnaea Brooker & Hopper
• Eucalyptus arborella Brooker & Hopper
• Eucalyptus archeri Maiden & Blakely
• Eucalyptus arenacea Marginson & Ladiges
• Eucalyptus arenaria Blakely accepted as Corymbia arenaria (Blakely) K.D. Hill & L.A.S. Johnson
• Eucalyptus argentescens K.D. Hill & L.A.S. Johnson
• Eucalyptus argillacea W.V. Fitzg. in Maiden
• Eucalyptus argophloia Blakely
• Eucalyptus argutifolia Grayling & Brooker
• Eucalyptus argyphea L.A.S. Johnson & K.D. Hill
• Eucalyptus arnhemensis D.J. Carr & S.G.M. Carr accepted as Corymbia arnhemensis (D.J. Carr & S.G.M. Carr) K.D. Hill & L.A.S. Johns
• Eucalyptus aromaphloia Pryor & Willis
• Eucalyptus aromatica (Salisb.) Domin accepted as Eucalyptus piperita Sm.
• Eucalyptus aromatica Noisette ex Chippendale accepted as Eucalyptus obliqua L'Herit.
• Eucalyptus articulata Brooker & Hopper
• Eucalyptus aspera F. Muell. accepted as Corymbia aspera (F. Muell.) K.D. Hill & L.A.S. Johnson
• Eucalyptus aspersa Brooker & Hopper
• Eucalyptus aspratilis L.A.S. Johnson & K.D. Hill
• Eucalyptus assimilans L.A.S. Johnson & K.D. Hill
• Eucalyptus astringens (Maiden) Maiden
• Eucalyptus atrata L.A.S. Johnson & K.D. Hill
• Eucalyptus atrovirens Brooker & Kleinig accepted as Corymbia dichromophloia (F. Muell.) K.D. Hill & L.A.S. Johnson
• Eucalyptus aureola Brooker & A.R. Bean accepted as Corymbia aureola (Brooker & A.R. Bean) K.D. Hill & L.A.S. Johnson
• Eucalyptus australasica (Blakely & Jacobs) L.A.S. Johnson & K.D. Hill
• Eucalyptus australiana R. Baker & H.G. Smith accepted as Eucalyptus radiata Sieber ex DC.
• Eucalyptus badjensis de Beuzev. & Welch
• Eucalyptus baeuerlenii F. Muell.
• Eucalyptus baileyana F. Muell.
• Eucalyptus bakeri Maiden
• Eucalyptus balanites Grayling & Brooker
• Eucalyptus balanopelex L.A.S. Johnson & K.D. Hill
• Eucalyptus balladoniensis Brooker
• Eucalyptus bancroftii (Maiden) Maiden
• Eucalyptus banksii Maiden
• Eucalyptus barberi L.A.S. Johnson & Blaxell
• Eucalyptus barklyensis L.A.S. Johnson & K.D. Hill
• Eucalyptus baudiniana S.G.M. Carr & D.J. Carr
• Eucalyptus baueriana auct. non Schauer accepted as Eucalyptus ovata Labill.
• Eucalyptus baueriana Schauer