Habenella, Genus – synonym of Platanthera, Genus
Habenorkis, Genus – synonym of Habenaria, Genus
Hammarbya, Genus – synonym of Malaxis, Genus
Hamularia, Genus – synonym of Bulbophyllum, Genus
Hapalochilus, Genus – synonym of Bulbophyllum, Genus
Hapalochilus, Genus – synonym of Codonosiphon, Section (Bulbophyllum)
Hapalochilus, Subgenus – synonym of Codonosiphon, Section (Bulbophyllum)
Haplochilus, Genus – synonym of Zeuxine, Genus
Harpobrachium, Subgenus – synonym of Uncifera, Section (Bulbophyllum)
Hecabe, Genus – synonym of Phaius, Genus
Hedyothyrsus, Section – synonym of Macrouris, Section (Bulbophyllum)
Hemithelasis, Section (Thelasis)
Henosis, Genus – synonym of Bulbophyllum, Genus
Herpetophytum, Section (Dendrobium)
Herpetorhizis, Section (Malaxideae)
Herpetorhizis?, Section (Malaxideae)
Hetaeriopsis, Section (Zeuxine)
Heteroblastos, Section (Malaxideae)
Heterozeuxine, Genus – synonym of Zeuxine, Genus
Hexameria, Genus – synonym of Podochilus, Genus
Hologlossa, Section (Habenaria)
Hologlossum, Section (Malaxideae)
Hologyne, Genus – synonym of Coelogyne, Genus
Hololobos, Section (Malaxideae)
Hololobos/Ophthalmodes, Section (Malaxideae)
Hoplandra, Section (Bulbophyllum)
Hordeanthos, Genus – synonym of Bulbophyllum, Genus
Hyalosema, Section (Bulbophyllum)
Hyalosema, Genus – synonym of Bulbophyllum, Genus
Hyalosema, Genus – synonym of Hyalosema, Section (Bulbophyllum)
Hybochilus, Section – synonym of Monanthes, Section (Bulbophyllum)
Hydranthus, Genus – synonym of Dipodium, Genus
Hymeneria, Genus – synonym of Eria, Genus
Hymenobractea, Section (Malaxideae)
Hymenobractea, Section – synonym of Lepidorhiza, Section (Bulbophyllum)
Hymenochilus, Genus – synonym of Pterostylis, Genus
Hypodematium, Genus – synonym of Eulophia, Genus
Hysteria, Genus – synonym of Corymborkis, Genus